Massachusetts Arms Company was created in 1849.
National Arms Company was created in 1865.
Syracuse Arms Company was created in 1888.
Lefever Arms Company was created in 1883.
DuBiel Arms Company was created in 1975.
Browning Arms Company was created in 1927.
Massachusetts Bay Trading Company was created in 2002.
U.S. Repeating Arms Company was created in 1981.
Winchester Repeating Arms Company was created in 1866.
Great Western Arms Company was created in 1953.
Birmingham Small Arms Company was created in 1919.
Massachusetts Mutual Life Insurance Company was created in 1851.
Here is a brief history: http://en.wikipedia.org/wiki/Massachusetts_Arms_Company