In the early days of automatic washers, there were many brands. There were also many brands of wringer washers when those were all you could buy and most of the names you listed were wringer washer brands wanting to have an automatic in the race as they stared the end of their industry in the face. Some were private label brands for department stores, like AMC, and specialty stores (Firestone). Think of the many brands of television sets there were in the early days. Every brand had to offer a TV. Magazines were full of ads. Of course, most had offered radios also, so it was not a huge leap and the stories about sets catching fire and picture tubes "burning out" were attributed to the newness of the phenomenon. It's a good thing the little sets were in metal cases and not plastic back then.
Neighbors on my paper route had just gotten rid of a Zenith for a GE V-12 and I will never forget this display of lack of mechanical understanding as long as I live. I came by and they had just started washing a load of whites in the newly delivered machine. The machine did not have a bleach dispenser, but they wanted to add bleach and the mother and two daughters (one a cheerleader) were wondering what to do. I said they could just pour the diluted bleach slowly into the filter pan. "OH NO! IT SAYS NEVER POUR BLEACH IN THE FILTER PAN." Well, no, not when the machine is not running and no water is flowing into the pan. So she STOPS the machine, removes the filter pan and pours the diluted bleach into the washer, then restarts it and, of course, since it was a two speed machine, it starts with slow agitation. I learned as much about the non-mechanical mind that day as I would ever want to know and I had thought my mother was bad.