Keystone Bridge Company was created in 1865.
Keystone Motor Company of Philadelphia was created in 1900.
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King Bridge Company was created in 1858.
Railroad Bridge Company was created in 1853.
Quincy Bridge Company was created in 1866.
Sibley Bridge Company was created in 1887.
American Bridge Company was created in 1900.
Keithsburg Bridge Company was created in 1881.
Quincy Memorial Bridge was created in 1928.
Pee Dee Bridge Company was created in 1911.
St. Louis Bridge Company was created in 1878.
Michigan Central Bridge Company was created in 1896.