colt remington smith & wesson mossberg
Many firearms manufacturers are owned and operated within the US. Among the more prominent manufacturers are Colt, Kimber, Springfield Armory, Bushmaster, Browning, Winchester, Marlin, Mossberg, Remington, etc.
general electric
BRNO ARMS
As far as firearms? Taurus and IMBEL are the big manufacturers there.
AFAIK, there isn't one.
a couple or so
Remington Arms is in fact the largest US producer of shotguns and firearms. They manufacture and sell arms to both the military and to civilians from various resellers and retailers.
You will have to be more specific... there are a lot of firearms companies and manufacturers called "Keystone". Got a city/state where they operated? Anything?
There are more than 129,817 Federal Firearms License holders in the United States, according to the latest Bureau of Alcohol, Tobacco, Firearms and Explosives numbers (as of Aug. 1). Of those, 51,438 are retail gun stores, 7,356 are pawn shops and 61,562 are collectors, with the balance of the licenses belonging mostly to manufacturers and importers of firearms and destructive devices.
Michelin is one of the largest tire manufacturers in the world, along with Bridgestone.
One of the largest manufacturers of envelopes is Office Depot. Other major envelope manufacturers include Staples, Gartner Studios, and Quality Park.