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High-tension bellows

Cutaway mechanical drawing of a player-piano pneumatic mechanism showing the vacuum chamber, key-pneumatics, tracker board with a perforated paper music roll passing over it, feeder bellows, and pedal linkage, alongside detail views of the tracker board slots and a music-sheet with rows of numbered perforations.

AUTOMATIC PIANO-PLAYERErnest M. Skinner · May 7, 1901

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