Flow-Matic

1984 was a bit past the peak for -Matic as a productive suffix, but that vintage still has: https://www.cs.princeton.edu/~appel/papers/rogomatic.html

Any significant use of the suffix this century?

And Cessna put the Land-O-Matic gear and Para-Lift flaps on their small planes around then; and of course you could get your Motor-Ola car radio.

There's GOT to be a Wikipedia page in here somewhere.