COOL DW
AMAZING.   The first dishwasher I ever saw, as a child. Came with my aunt's home that was built around that time.  SIX water changes, and began with a rinse to purge cooler water from the lines. TWO closed detergent cups.   Main motor ran continuously like a GE or KA.    AH MEMORIES.
There may have been a move toward one motor, rather than two or more, in that the mind-set of the time was that one was more reliable than two! 
Any videos of it running?