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File:Britannica Pianoforte Erard Double Escapement Action.png - Wikimedia Commons
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File:Britannica Pianoforte Erard Double Escapement Action.png - Wikimedia Commons
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Grand Piano "repetition" World Record! | Video: Grand Piano "Repetition" World Record! . In 1821 Sebastien Erard of France patent what he called the "Double Escapement" or double repetition... | By Golden
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What is escapement on a piano? - Quora
