Tom,
No, I have never figured out who made the early Homart and Kenmore branded dishwashers sold by Sears.
I agree - they are unlike any other dishwashers manufactured in the early 1950's. So can we speculate? The early Walker, Conover and Kohler dishwashers all had round tubs. Perhaps there was someone associated with one of these companies that still had an engineering love for dishwashers and lent Sears a hand. AVCO certainly should also be considered, since the dishwasher division of that company became known as D&M in the late 1950's. And one more consideration - the Youngstown Jet-Tower top loading dishwashers also had a round tub, and the Youngstown Electric Sink cabinet sure resembles that of the Sears Homart and Kenmore Electric Sink. Will we ever know for sure?
Mike