Ah yes, the mid to late 60's & the 70's. Kenmore dishwashers were being made by D & M back then and were quite good at cleaning the dishes. D & M had been making impeller machines up till the spray arm machines. In fact, the last impeller machines incorporated this same round top rack with a stationary sprayer under the top round rack that rotated as it sprayed like this one did. Naturally the spray arm on the bottom made it much easier to load dishes and improved the cleaning power also. D & M made rebadged dishwashers under many different names. Their machines were quite easy to work on and most parts readily available.