I think I may have a motor off one of these players.  It's an air motor
like none other I have seen.  It's a series of pistons connected by a
crankshaft, no slide valves or pneumatics, the whole thing being made
of metal.

In fact, I had two of them at one time but gave one away.  They came to
me years ago in a box of parts motors, so I have no idea what the player
action looked like or what piano it came from.  I can email photos if
anyone is interested.

Bruce Mercer