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Parker Hannifin

 
Hoover's Profile: Parker Hannifin Corporation
(NYSE:PH)
Company Financials
Income Statement
Balance Sheet
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Contact Information
Parker Hannifin Corporation
6035 Parkland Blvd.
Cleveland, OH 44124
OH Tel. 216-896-3000
Fax 216-896-4000

Type: Public
On the web: http://www.parker.com
Employees: 51,639
Employee growth: (16.3%)

Motion-control equipment made by Parker Hannifin helped sink a replica of the "Titanic" in the Academy Award-winning film. Parker Hannifin's motion-control products use hydraulic (liquid) or pneumatic (gas or air) systems to move and position materials or to control equipment. Its Industrial segment manufactures fluid connectors, purification systems, hydraulic and automation systems, electromechanical devices, seals and filters, and process instrumentation. The other two business segments include Climate & Industrial Controls (refrigeration and air conditioning components) and Aerospace (hydraulics, and fuel and engine systems). The company has operations in about 40 states and almost 50 foreign countries.

Key numbers for fiscal year ending June, 2009:
Sales: $10,309.0M
One year growth: (15.1%)
Net income: $508.5M
Income growth: (46.4%)

Officers:
Chairman, President, and CEO: Donald E. (Don) Washkewicz
EVP Finance and Administration and CFO: Timothy K. Pistell
VP and CIO: William G. Eline

Competitors:
Eaton
Honeywell International
Invensys

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Company History: Parker-Hannifin Corporation
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Incorporated: 1918 as Parker Appliance Company
SIC: 3593 Fluid Power Cylinders & Actuators; 3594 Fluid Power Pumps & Motors; 3728 Aircraft Parts & Equipment Nec; 3714 Motor Vehicle Parts & Accessories

Motion control through the use of air, liquid, and gas is the principal concern of Parker-Hannifin Corporation. Operating internationally through numerous subsidiaries, the company manufactures fluid power systems and components for use in industrial machinery, military equipment, air, sea, and space craft, and automobiles.

Parker-Hannifin started as an automobile brake company. The automotive market has been a lucrative one since its early 20th-century infancy. Thought of at first as a rich man's toy, private transportation was within the reach of the middle class well before 1911, when Henry Ford sold 78,000 Tin Lizzies. By 1918, the first year of the Parker Appliance Company's existence, there were more than one million cars a year coming out of factories in Detroit, Michigan; Cleveland, Ohio; and other centers.

Engineer-inventor Art Parker entered this profitable field modestly, with a pneumatic brake booster designed to make stopping easier for trucks and buses. This initial effort was doomed; the company's first promotional tour came to an abrupt end when an ice patch on a Pennsylvania hill sent Parker's only truck careening over a cliff. This catastrophe sank his bank balance but did not douse his dream of heading a motion control manufacturing business.

In 1924 he tried again, offering new flared-tube fitting components to expand his one-product line. Useful for many purposes, these attracted a wide variety of industrial manufacturers. The successful new start encouraged Parker to broaden his horizons. Noting opportunities in the fledgling aviation industry, he made lifelong customers of such pioneers as Donald Douglas of Douglas Aircraft Company and Robert Gross of Lockheed, who soon learned to rely on him as much for his knowledge of hydraulics as for dependable parts. Parker accepted their challenges willingly, helping them to design a hydraulic successor for the heavy gear-and-chain-driven parts then being used to move all airplane control surfaces. This cooperation was so valuable that neither Parker nor the flight industry suffered during the Depression. Instead, all parties flourished, aided by the growing military importance and commercial potential of their products.

Like the aviation section, the automotive division of the Parker Appliance Company grew during the Great Depression years. Though there was a drop of almost 500,000 in privately owned vehicles between 1930 and 1935, this decline did not affect Parker's profits. Travelers without their own cars simply used buses, which always need parts for maintenance and repair.

Now indispensable to two transport industries, the company achieved $2 million in sales in 1934. Other businesses were not so lucky: although almost four million cars rolled off assembly lines in 1935, many smaller factories had to close their doors. A victim of the Depression, the bankrupt Hupp Motor Car Corporation sold its Cleveland building to Parker.

By 1938 the company was ready to look for international markets for its aircraft components. Technologically advanced in both the automotive and the aviation fields, Germany seemed to be a good prospect. Parker and his wife, Helen, changed their minds after a three-month tour of German aircraft factories, because the activity they saw there convinced them that Adolf Hitler was arming for war.

Once back in Cleveland, Art Parker took immediate action. First, he licensed several patents for military aircraft parts that would broaden his previously patented product lines. His next step was to concentrate his energies on the aircraft market, shifting his focus from the automotive side of the business. Then, he placed an order for lathes--the largest that his manufacturer had ever filled.

Equipping his business for the demands of war took huge amounts of money. No longer able to channel capital from his recently abandoned commercial and industrial base, Parker insured himself against a cash-flow shortage by selling 10,000 shares of stock. During the final days of 1938, Art Parker saw his business become a public company.

By the time President Franklin Roosevelt declared war on Japan and its allies in December 1941, patents held by the Parker Appliance Company were setting standards for such components of military aircraft as hydraulic tube couplings, fuel system valves, and pumps. Two years later, there were 5,000 employees working three shifts seven days a week to produce these parts.

Though urgent at the time, this focus on purely military equipment to the exclusion of other business proved costly after the war. Art Parker, who died eight months before hostilities ended, however, was spared the sight of idle factory floors and the employment roll that had shrunk to 200 people as soon as the company's lone customer, the U.S. government, turned its attention back to peacetime pursuits. Although the prospect of bankruptcy now faced Helen Parker, she chose to keep the business running and to recruit new management.

With the help of the company's banker, Charles Sigmier, S. Blackwell Taylor was persuaded to assume the presidency of Parker and to bring his business associate Robert Cornell with him. The two men set to work immediately, selling off surplus inventory and machinery before they did anything else.

Setting long term goals to provide direction was their second task. The strategic operations plan they formulated, quickly dubbed the Corporate Creed, emphatically stated that the company was not for sale. It also stressed that management would now strive to reduce the percentage of government business, while still increasing sales to government customers; a wise precaution that would stand the company in good stead during the Korean War. Other proposals declared that growth would henceforth take place both internally, through research and development, and externally, through friendly acquisitions. Parker, however, had to be the dominant party in all acquisitions, which would be undertaken to expand the company's product lines and keep it on the cutting edge in the field of fluid power. Targets would be profitable family-owned businesses wherever possible, and each new subsidiary would enjoy considerable autonomy. Along with these decisions came the resolve to supply only top quality products and service.

The postwar era also brought increasing interest in automation, much of which relied on fluid power to control motion through pneumatics and hydraulics. Making every effort to meet these needs by developing the range of their products, Parker also began to experiment with synthetic rubber to be used for more effective seals. The demand for these seals soon became so universal that the company became a leader in the worldwide standards that were benefiting original-equipment industries as well as many other engineering concerns. Another innovation was the decision to emphasize the production of replacement parts for those components whose constant motion caused them to wear out.

In 1957, a year that showed sales totaling $28.5 million, the Parker Appliance Company acquired the Hannifin Corporation of Des Plaines, Illinois. A manufacturer of hydraulic and air-power cylinders and of presses and other essential products used in liquid, gas, or air pressure systems, Hannifin was not a small company itself. Its $7.5 million price brought Parker two Illinois plants and one in Ohio, plus an employee roll of 600. It also brought a name change, for the Parker Appliance Company now became the Parker-Hannifin Corporation. In line with company policy, the former Hannifin customers now became customers of the entire corporation. Also in line with company policy, the new acquisition was assured that there would be no competition for the original equipment manufactured by clients.

In 1960 Parker-Hannifin organized an international division to market its products worldwide. Situated in Amsterdam, it was followed in June 1962 by Parker-Hannifin NMF GmbH in Cologne, West Germany, a subsidiary gained by the purchase of Niehler Maschinenfabriek, a manufacturer of hydraulic components. These two new channels brought the company a stronger market for valves, pumps, hoses, air filters, and regulators, as well as for the industrial products of its other ten semi-autonomous subsidiaries.

Also burgeoning at this time was the aircraft division, which had entered the specialized field of cryogenics. Joining the product line of tube fittings, missiles, space vehicles, and systems for the control of wing flaps and landing gear was a ball valve handling liquid oxygen for the Saturn space booster. Other components for both commercial and military use included hydraulic torpedo parts and ground support equipment. Important for military action, these items played a significant strategic role when the United States entered the Vietnam War in 1965. Later this division would produce another important device; a special assembly for the main flight control of the Sikorsky Black Hawk helicopter. Consisting of only five pounds of bulletproof steel, it continued to function if damaged.

Keeping ahead of the competition in these ways had taken a great deal of prior planning. Mindful of the need for ultra-modern manufacturing plants, in 1961 the company had made a heavy investment in equipment to increase capacity and improve operating efficiency. This paid off handsomely the following year, with year-end sales of more than $61 million.

This modernizing, plus the strategic acquisition of profitable foreign companies that continued throughout the 1960s, added a line of refrigeration components and expanded the range of other Parker-Hannifin products now being made in Canada, Italy, France, and South Africa. Like domestic plants, overseas plants manufactured standardized components that were easily replaceable. The wisdom of this practice was reflected in 1967 sales, which totaled more than $152 million.

In 1968, outgoing President Robert Cornell was succeeded by the founder's son, Patrick Parker. Parker had spent three years running the seals division after gaining experience in various departments in Cleveland. Parker introduced new training for machine operators to ensure skilled technical labor for affiliates and subsidiaries. Next came two 1973 courses for distributors and customers. Designed to explain the increasingly complex range of Parker-Hannifin products, the first course covered basic industrial hydraulic technology; the second, advanced circuit analysis.

To reduce Parker-Hannifin's vulnerability to the cyclical swings of the capital goods field, the new CEO focused on the lucrative automotive aftermarket. Reasoning that wear on cars always makes replacement parts necessary, he set his sights on the Plews Manufacturing Company, a maker of quick-disconnect couplings, acquiring this concern in 1968. A 1971 newcomer was the Ideal Corporation, which manufactured hose clamps and turn indicators. Following shortly afterwards were the Roberk Company, which made windshield wipers and rear view mirrors, and in 1978, EIS Automotive Corporation, manufacturers of hydraulic replacement parts for drum- and disc-brake systems.

The automotive section was not the only business segment receiving company attention at this time. The aerospace division, although offering a profit potential of 14 percent--compared to 12 percent apiece from the other two units--was not growing fast enough. In 1978 Parker-Hannifin remedied this situation by broadening both its customer base and its product line. Parker-Hannifin acquired two new subsidiaries: Vansickle Industries, a maker of replacement wheels and brakes for light-weight private aircraft, and Bertea Corporation, providing electro-hydraulic flight controls for commercial airliners. Both companies had previously been leaders in their fields, Bertea showing a 12-month backlog of orders as well as a $19 million contract on primary flight-control actuators for new Boeing 767 airliners.

Internal efforts were also needed to pull the company successfully through business cycle troughs. A recession in 1971, causing profits to tumble, prompted a new strategic plan called cycle forecasting. The brainchild of Tommy McCuiston, vice-president of corporate planning, the forecasting plan is based on the premise that each industry follows its own cyclical rhythm for a period normally lasting three to four years. Six phases are apparent during this time span: growth, prosperity, warning, recession, depression, and recovery. Each phase demands planning providing for the next. During the growth phase, the company anticipates prosperity by expanding the work force and speeding up its training programs. In line with its acquisition philosophy, it also looks for new manufacturing sources. The prosperity phase finds Parker-Hannifin executives planning for the months of warning ahead. Expansion is curbed and superfluous companies are sold at this period of peak earning power. The kingpin of the strategy is strict inventory control, allowing for heavy manufacturing activity during depression periods, before growth phase demand makes production expensive because of overtime wages.

Proof of the strategy's success came with the year-end sales figures for 1980, which passed $1 billion for the first time. Another benefit of the planning came to the fore in the research field, allowing the company to move actively into the field of biomedical engineering. Here, long-used principles of hydraulics were applied to the development of life-enhancing equipment like the implantable insulin dispenser for diabetics, made by the aerospace division.

In 1984, Paul Schloemer succeeded Patrick Parker as CEO and president. Adding 14 acquisitions to Parker's previous 50, Schloemer guided the corporation into the untapped areas of industrial filters and pneumatics, with the addition of Schrader Bellows, in 1984; and electromagnetic motion control, with the acquisition of Compumotor in 1986.

The 1980s brought other significant changes. A weaker dollar against the Japanese yen and the West German mark lost a considerable amount of value between 1984 and 1987. This brought down the price of U.S. technology and products to a level competitive with those of Japan and Europe, making it cheaper to produce components for foreign machinery in the United States than to import them for later assembly.

The automotive market scored heavily here. Quoted in a 1987 article in Fortune, investment strategist John Connolly noted that between 1986 and 1987, Honda had scaled down from one-half to one-quarter the number of parts it planned to import for cars assembled in the United States. This trend, plus joint product ventures like the Mazda/Ford Probe alliance assured a market for automotive components that helped Parker-Hannifin achieve more than $2 billion in sales in 1988, its 70th anniversary.

Other promising trends for growth came from the aerospace division. Several air disasters and near misses brought commercial airlines and air safety associations to the conclusion that tighter maintenance procedures and more frequent replacement of aircraft were necessary. This meant a greater need for complete hydraulic systems and parts for aircraft in frequent service.

In November 1989 Parker-Hannifin sold its three automotive aftermarket components divisions to an investor group headed by the president of the Parker automotive group. The company received about $80 million in exchange for its automotive parts business, and continued to manufacture original equipment for the automotive market. Parker-Hannifin also divested its small biomedical group in January 1990. The biomedical group had 1989 sales of about $4 million. These sectors were sold to allow Parker-Hannifin to concentrate on its core motion control markets--both industrial and aerospace.

Nevertheless, growth by acquisition continued into the 1990s under the leadership of CEO Duane E. Collins, driving sales above the $3 billion mark by 1995. The 1996 purchase of Swedish-based VOAC Hydraulics fortified the company's product line with hydraulic systems for mobile heavy equipment. The Abex/NWL division of Pneumo Abex, also acquired in 1996, supplied aerospace hydraulic actuation gear. Parker-Hannifin bought New Jersey-based EWAL Manufacturing, a maker of fittings and valves, in 1997.

After 60 years, Parker-Hannifin moved into a new, 125,000-square-foot headquarters in August 1997. It donated the old headquarters building at 17325 Euclid Ave. to the Cleveland Clinic Foundation, an institution promoting medical research.

Parker-Hannifin's sales had grown vigorously, due to the earning power of its acquisitions, success in new markets abroad, and to sheer good fortune. Many plants had to run at full capacity in order to keep up with orders. It seemed Parker-Hannifin's investments in superior technology, commitment to customer service, and attention to timing and the business cycle were paying off.

Principal Subsidiaries

iPower Distribution Group Inc.; Parker de Puerto Rico, Inc.; Parker-Hannifin International Corp.; Parker Intangibles Inc.; Parker Properties Inc.; Parker Services Inc.; Abex Industries GmbH (Germany); Acadia International Insurance Limited (Ireland); Alenco (Holdings) Limited (United Kingdom); Brownsville Rubber Co., S.A. de C.V. (Mexico); Ermeto Productie Maatschappij B.V. (Netherlands); Parker Automotive de Mexico S.A. de C.V.; Parker Enzed (N.Z.) Limited (New Zealand); Parker Seal de Baja S.A. de C.V. (Mexico); Parker Seals S.p.A. (Italy); Parker Sistemas de Automatization S.A. de C.V. (Mexico); Parker Zenith S.A. de C.V. (Mexico); Parker Hannifin (Africa) Pty. Ltd. (South Africa); Parker Hannifin Argentina SAIC; Parker Hannifin A/S (Norway); Parker Hannifin (Australia) Pty. Ltd.; Parker Hannifin B.V. (Netherlands); Parker Hannifin (Canada) Inc.; Parker Hannifin Danmark A/S; Parker Hannifin de Venezuela, C.A.; Parker Hannifin (Espana) SA; Parker Hannifin GmbH (Germany); Parker Hannifin Hong Kong Limited; Parker Hannifin Industria e Comercial Ltda. (Brazil); Parker Hannifin Japan Ltd.; Parker Hannifin NMF AG (Switzerland); Parker Hannifin Oy (Norway); Parker Hannifin plc (United Kingdom); Parker Hannifin RAK, S.A. (France); Parker Hannifin S.p.A. (Italy); Parker Hannifin Sp. z.o.o. (Poland); Parker Hannifin S.r.o. (Czech Republic); Parker Hannifin Singapore Pte. Ltd.; Parker Hannifin Sweden AB; Parker Hannifin Taiwan Ltd.; Polar Seals ApS (Denmark); VOAC Hydraulics AB (Germany).

Principal Divisions

Atlas Cylinder; Daedel Division; Fluidex Division; Parker Compumotor Division; Air and Fuel Division; Airborne Division; Aircraft Wheel and Brake Division; Automotive Connectors Division; Brass Division; Commercial Filters Division; Control Systems Division; Cylinder Division; Finite Filter Division; Fluidpower Pump Division; Fluidpower Sales Division; Hose Products Division; Hydraulic Filter Division; Hydraulic Valve Division; Instrumentation Connectors Division; Instrumentation Valve Division; JBL Division; Pneumatic Division; Quick Coupling Division; Refrigeration and Air Conditioning Division; Schrader Bellows Division; Tube Fittings Division; Startoflex Aerospace/Military Division; United Aircraft Products Division.

Principal Operating Units

Fluid Connectors; Instrumentation; Filtration; Hydraulics; Automation; Climate & Industrial Controls; Seal; Aerospace; Asia Pacific; Latin America.

Further Reading

Byrne, Harlan S., "High Stepper," Barron's, February 12, 1996, p. 18.

Ozanian, Michael K., "17325 Euclid Avenue," FW, November 8, 1994, pp. 50-53.

Parker-Hannifin Corporation, "Targets: A Decade of Prodigious Employee Achievement," http://www.parker.com/corp/annualreport/targets.html.

Parker, Patrick, Parker-Hannifin Corporation, New York, The Newcomen Society in North America, 1980.

Wrubel, Robert, "Sum of the Parts," Financial World, February 23, 1988, pp. 24-25.

— Gillian Wolf; Updated by Frederick C. Ingram


Wikipedia: Parker Hannifin
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Parker Hannifin Corporation
Type Public NYSE
Founded 1918, Cleveland, Ohio, USA
Founder(s) Arthur L. Parker
Headquarters Cleveland, Ohio, USA
Number of locations 287 Manufacturing sites worldwide
Area served Worldwide
Key people Donald E. Washkewicz
Industry motion control, seals, industrial, aerospace, EOG, life sciences
Products pipe fittings, hydraulics/pneumatics, seals, controls, integrated motion components and assemblies
Revenue $12.1 Billion (FY 08)
Website http://www.parker.com/

Parker Hannifin Corporation (NYSEPH), originally Parker Appliance Company, usually referred to as just Parker, of Cleveland, Ohio, is a manufacturer of motion and control technologies. The company was founded in 1918, and has been publicly traded on the NYSE since December 9, 1964. Parker Hannifin is one of the largest companies in the world in motion control technology and employs around 39,873 people.[1]

As of 2009, the company is ranked 221 in the Fortune 500.

Contents

Business groups

Parker is divided into eight technology groups.

  • Fluid Connectors
  • Instrumentation
  • Filtration
  • Hydraulics
  • Automation
  • Climate & Industrial Controls
  • Sealing and Shielding
  • Aerospace

History

Milestones:

  • 2001: Parker has made 58 strategic acquisitions since the Company's founding. In Europe Parker acquired several large companies in the fluid power business from 1997 and forward, such as Commercial Hydraulics and VOAC Hydraulics[2][3].
  • 1997: Parker moves to brand new World Headquarters building in Mayfield Heights, Ohio; a suburb of Cleveland.
  • 1992: Parker globalizes its business by forming worldwide product groups.
  • 1988: Marking its 70th anniversary, Parker makes seven acquisitions and exceeds $2 billion in sales.
  • 1983 Parker forms joint venture in China.
  • 1978 Parker strengthens its position in aerospace market with a large acquisition which lays the foundation for future leadership in flight controls, hydraulics, and fuel management systems.
  • 1966 Parker Hannifin enters Fortune 500 listing of top companies.
  • 1964 Shares of Parker Hannifin stock are traded on the New York Stock Exchange for the first time.
  • 1960 New International Division formed to market Parker products abroad.
  • 1957 Acquisition era is underway. With Hannifin comes new cylinder and valve products and a new corporate name: Parker Hannifin Corporation.
  • 1945 Company founder Arthur Parker dies; World War II's end halts defense contracts. With no industrial business, the Company faces near liquidation. Founder's wife, Helen Parker, refuses to give up; hires new management which gradually rebuilds industrial business.
  • 1943 Parker employs 5,000 Clevelanders, all in defense production.
  • 1935 In the midst of the Depression, optimistic Arthur Parker buys a 450,000 square foot Cleveland auto plant from Hupp Motorcar Corp. to house his 38-employee Company.

1927 Parker's reputation for producing reliable, high pressure connections leads aviator Charles Lindbergh to specify Parker fittings for the Spirit of St. Louis' historic first Atlantic crossing.

Very early in the company's history a truck accident destroyed all of its inventory. Parker Appliance Company became bankrupt, and its founder returned to an engineering post at a Nickel Plate Railroad plant, but vowed to start again. In 1924 Arthur Parker restarted the company and the pneumatic/hydraulic components division succeeded by serving automotive and aviation customers.[4]

Environmental record

In 2006 Parker Hannifin Corporation and Get Nitrogen Institute, a non-profit organization, teamed up to test and promote the use of nitrogen filled rubber tires. By doing this, it has been found that nitrogen-filled tires hold their air pressure for longer periods of time increasing the life of the tire itself and decreasing the amount of discarded tires filling up landfills. Furthermore, it was found that having properly inflated tires improves fuel efficiency by 4 percent.[5]

Boeing 737 incidents

It was discovered in 1995 that failures in a servo unit supplied by Parker Hannifin to Boeing for use in their 737 aircraft may have contributed to several incidents.[6][7]

In 2004, a Los Angeles jury ordered Parker Hannifin to pay US$43M to the plaintiff families of the 1997 SilkAir Flight 185 crash in Indonesia. Parker Hannifin subsequently appealed the verdict, which resulted in an out of court settlement for an undisclosed amount, even though the NTSB and the Indonesian Transportation Safety Board determined the crash was caused, possibly intentionally, by the pilot.[8][9]

The FAA ordered an upgrade of all Boeing 737 rudder control systems by November 12, 2002. Parker argued that the components they supplied were not at fault, citing that the product has one of the safest records in its class, but The FAA directive went through regardless.[10]

References

  1. ^ Standard and Poor's 500 Guide. Peterson's. 1999. pp. 495. ISBN 9780768902143. 
  2. ^ VOAC is an acronym for Volvo Flygmotor (later Volvo Aero) and Atlas Copco that in mid 1980's formed a holding company in the hydraulic manufacturing business, with the company Monsun-Tison AB as the main hydraulic manufacturing company for mobile valves and cylinders. The idea with the holding company was to promote the development and manufacturing of mobile hydraulic components adapted for Atlas Copco's blast hole drilling equipment and hydraulic components in general in Sweden. The holding Co., AVC intressenter, was owned 50/50 by Volvo Flygmotor and Atlas Copco. Volvo Flygmotor's main business in hydraulic components was based on the F11-series high-speed axial piston hydraulic motors with spherical pistons, that was invented by the Swedish engineer Gunnar A. Wahlmark (Illinois U.S.A.) and patented in 1960. USPTO patent no. 2956845, oktober 1960. The application for the trademark VOAC was first filed by USPTO November 18, 1992 and registered in March 29, 1994. When the holding company later was closed down, the trademark VOAC was kept for hydraulic components within the company Monsun-Tison AB including the F11-motors and pumps from Volvo Hydraulics AB (company formed by Volvo Flymotor in 1983), and the company VOAC Hydraulics AB, Sweden was later formed around this trademark. In Februari 1996 Parker acquired VOAC Hydraulics AB. As VOAC owned the CAN-buss based control system IQAN, developed by a small Swedish company outside VOAC around 1990-1995, the IQAN system was integrated into Parkes products for mobile machinery.
  3. ^ Press release Parker acquires VOAC of Sweden
  4. ^ Eugene Converse Murdock (1988). The Buckeye Empire: An Illustrated History of Ohio Enterprise. Windsor Publications. pp. 176. ISBN 9780897812504. 
  5. ^ Mal Gormley. "Will Climate Change Challenge BizAv?". Aviation Week. http://www.aviationweek.com/aw/generic/story_generic.jsp?channel=bca&id=news/bca0307d.xml&headline=Will%20Climate%20Change%20Challenge%20BizAv?. Retrieved 2008-11-16. 
  6. ^ Robert J. Boser. "What is the status of the solution to the B-737 rudder design defect?". airlinesafety.com. http://www.airlinesafety.com/faq/B-737Rudder.htm. Retrieved 2008-11-18. 
  7. ^ "Pittsburgh disaster adds to 737 doubts". Seattle Times. 1996. http://seattletimes.nwsource.com/news/local/737/part03/. Retrieved 2008-11-17. 
  8. ^ SilkAir 185 - Pilot Suicide?. [Documentary]. National Geographic. 2007. http://www.youtube.com/watch?v=C3ZIE2YIV_Y&NR=1. 
  9. ^ "Remembering the Musi – SilkAir Flight MI 185 Crash Victim Identification", Annals Academy of Medicine 36 (10): 866, 2007, http://www.annals.edu.sg/pdf/36VolNo10Oct2007/V36N10p861.pdf 
  10. ^ "Airworthiness Directives; Boeing Model 737 Series Airplanes". FAA. http://www1.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/0/2a37f5faba444a8086256c4b005a2884/$FILE/022007.pdf. Retrieved 2008-11-17. 

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