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Pneumatic-free key actuator

Patent drawing of a rectangular case fitted over a piano or organ keyboard, showing internal rollers, a crank wheel, a perforated metal sheet feeding through gears, and rows of pins aligned with keys.

AUTOMATIC ORGAN-PLAYER.John August Brodin · July 31, 1894

United States patent drawings and specifications are works of the U.S. government and are in the public domain — they were never copyrighted. Download them, print them, frame them. Our commentary and descriptions are © 2026 The Talking Machine Patent Archive.

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