Performer-supported keyboard
Piano mechanism
Piano motor
Piano player
Piano player
Piano player
Piano player mechanism
Piano playing mechanism
Player piano
Player piano action
Player piano action
Pneumatic action for mechanical players
Pneumatic pianoforte
Programmable rhythm apparatus
Programmable rhythm unit
Ratchet regulator for note sheet controls
Relay valve and tracker bar or tubing assembly apparatus for...
Releasable coupling for piano action mechanism
Rewind mechanism for player musical instruments
Self-playing musical instrument