I Could Name Several!
Air-Way, Apex, General Electric, Lewyt, Kingston, Regina (they did make actual vacuum cleaners in addition to their Electrik-Brooms and polishers), Clements (they made Cadillac and a few other brands), Birtman (BeeVac and Kenmore), and Westinghouse. I might mention here that GE and Westinghouse were both full line appliance manufacturers, and both stopped making vacs in the late 60's (Westinghouse) and early 70's (GE).
Jeff