Kenmore!
These were made by Birtman Electric Co, same company that made the Bee Vac, Birtman was part of the big Whirlpool takeover, instigated by Sears in 57,Sears wanted the vacuums and refrigerators to be consolidated with the washers and dryers under one manufacturing management, so they schemed with Whirlpool to buy out Seeger Refrigerator co of Evansville Indiana, and Birtman of Chicago,But this mixer you have is exactly like my yellow one, 1956, and built by Birtman electric, later I believe Whirlpool let Hamilton Beach have the mixer production.