Drum for music box

Drum in music box

Dynamic driving structure for the ornamental music box

Dynamically adaptive player piano roll to magnetic tape formatin

Electric music box powered by wind-up

Electro pneumatic player piano

Electro-pneumatic action for player piano

Electromagnetic actuator used for keyboard musical instrument

Electromagnetic devices for actuating piano keys

Electromagnetic devices for actuating piano keys

Electronic acoustic music engine

Electronic keyboard musical instrument

Electronic percussion instrument

External structure of crystal ball driven by an eccentric shaft

Fingering guide displaying apparatus for musical instrument...

Flasher switch with a mechanical music mechanism

Flying block assembly for speed regulation of music box

Frequency number controlled clocks

Gas driven music box

Hammering operation control unit of piano accompanied with autom