Obenchain - Boyer CO (? - 1925 - Logansport, IN)	Odyssey (Unknown - date - Unknown)	Oilmen's Truck Tanks (1994 - date - Spartanburg, SC)	Olsen Mfg Co (unknown - Minneapolis, MN)	Olson Body Co (1977 - 1988 - Brooklyn, NY)
One-Wheeled Tractor Co (1918 - St. Louis. MO)	Oren Fire App Co (Oren Roanoke Corp 1947 - 1965; Howe-Oren 1965 - 1975) 1 (1933 - 1946 - Roanoke, VA)	Oren Fire App Co (Oren Roanoke Corp 1947 - 1965; Howe-Oren 1965 - 1975) 2 (this logo 1960 - 1983) (1933 - 1946 - Roanoke, VA)	Oshkosh Truck Co (1937 - date - Oshkosh, WI)	Ottawa Brimont Corp. (1985 - 1988 - Ottawa, KS)
Ottawa Truck Corp. (1988 - 1992 - Ottawa, KS)