Fascinating!
Around here, it seems that the blast off year for dishwashers was 1967. We were among the last on our block, in 1973.
I cannot imagine kitchen life without a dishwasher. Doing more than a very few dishes by hand is an enormous bore and hard on the lower back, as well.
Dishwashers make entertaining not only possible, but even appealing. They are wonderful to have on kitchen project days.
Not entirely convinced of the value of "sani"-cycles,
but I completely believe that a good dishwasher cleans better than washing by hand, anyway. Unless a person uses Purell, or similar, after they open the machine, and before unloading, there are a few germs on the hands.
At church, we have always had a Hobart (we're on our second, the first was original to the 1956 construction), and a few of the wooden racks still are there, but of course the City Health Department does not let us use them.
Lawrence/Maytagbear