Golden Era Piano Museum. - The Golden Era Piano Museum :"Sebastien Erard" 90 note Grand Piano-Forte c1886. France. Érard's grand piano action (English patent no 4,631, 1821) is the predecessor to those
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File:Britannica Pianoforte Collard Grand Piano Action 1884.png - Wikimedia Commons
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English action (c. 1771) 5 | Download Scientific Diagram
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