There’s certainly a couple of models of the Braune/Batric carts. They seem to have been made starting in the 1960s but not sure exactly when. The invalid cars were more successful and were certainly produced into the 1980s.
I wonder if the carts and invalid cars used much the same (or interchangeable) wiring, motor and battery systems?
There are some photos of the Braune/Batric stuff in the gallery.
