Cristofori action" - Escapement action for early fortepiano by Bartolomeo Cristofori, 1726 - YouTube
7) "Cristofori action" - Escapement action for earliest fortepiano by Bartolomeo Cristofori, 1726 - YouTube | Piano repair, Piano, Voice lesson
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keyboardamerica.com/CLP-665
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File:Britannica Pianoforte Erard Double Escapement Action.png - Wikimedia Commons
Piano Maker's Corner: Escape Velocity – Piano Addict
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The Pianoforte until the end of the 18th century – The Salon Music Blog
Ask a Pianist - Playing Above the Escapement - YouTube
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Sébastien Érard & The Double Escapement Action - YouTube
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Double escapement - limit cycle - YouTube
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