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Perforated music card

Patent drawing showing a rectangular wooden frame housing a fan-shaped array of thin rod-like note-levers converging toward a central perforated music card mechanism, with rows of upright key-striking arms labeled G* extending outward, and control rods and gearing at the base of the frame.

KEY-BOARD ATTACHMENT FOR MUSICAL INSTRUMENTS.Robert Hodges Bishop and William Down · February 10, 1885

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