It lists a pre-rinse and first wash, a second rinse, a second wash heated to 145F, if selected, a third rinse, 145F, if selected, and drying. I was not aware of one after rinse machines in the early 60s. My guess is that they did not want a rinse between the heated wash and the heated rinse to cool the dishes by a fill with water that had been sitting in the lines for the considerable time it took to heat the second wash to 145F. Throwing that water on the 145F dishware only cooled it enough to slightly delay the cycle for heating, maybe.
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