Being a newbie to commercial dishwshers, can you let us know approximately what year the first and second series of brochures that you posted date from? Thanks for the great posts!
The parochial school I went to still has a fully functioning Model AM-6, and the county nursing home where my grandmother resides has the Model XXM-4 still in daily use. I used the AM-6 as a cafeteria aide in 8th grade. I've also seen the XXM-4 in use as I've had to walk past the kitchen when grandma was doing an activity in the dining room when I was there for a visit. That dining room had a very strong chlorine smell because of the dishwasher being so close to the doorway.
As far as I know, there are a few UMs, AMs, and maybe one or two XMs or CMs still in operation here on the Cape. As they are probably in Seasonal Restaurants that are only ran 4-7 months out of the year.