Skip to content

The Talking Machine Patent Archive

Patents you could hear

Browse Dates Inventors Types About

Cone-pulley

Cutaway perspective drawing of a piano corner exposing internal gears, pulleys, belts, a motor, and an electric switch mechanism beneath the keyboard and leg.

ELECTRIC PIANOGeorge Schrade and Harold W. Shonnard · May 2, 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.

About · Terms · Privacy · Corrections welcome — this archive gets better when collectors write in.