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Perforated pattern-sheet

Mechanical drawing of a patent showing a spool-fed perforated paper pattern engaging a toothed carrier gear that drives a cylinder studded with spring-loaded dogs, which strike a row of pivoted levers connected to piano keys, with detail insets of the fixed hub, cam, dog, ring, jack, and a section of the punched pattern sheet.

PATTERN-OPERATED MECHANICAL MOVEMENTMartin E. Greenhouse · December 5, 1899

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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