US PATENT SUBCLASS 984 / 65
.~.~.~ Involving the use of hydraulic, pneumatic, or electromagnetic means {G10C 3/20}

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984 /   HD   MUSICAL INSTRUMENTS

50  DD  PIANOS {nonmusical aspects of toy pianos A63H 5/00; Aspects of automatic actuation subclasses 200+; Combinations of microphones, pick-ups or amplifiers with musical instruments subclasses 300+} {G10C} {4}
55  DD  .~ Details of, accesories for, pianos or the like {G10C 3/00} {10}
63  DD  .~.~ Actions {G10C 3/16} {4}
65.~.~.~ Involving the use of hydraulic, pneumatic, or electromagnetic means {G10C 3/20}