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Double escapement piano
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200th Anniversary of Érard's Double Escapement Action
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Cristofori action" - Escapement action for early fortepiano by Bartolomeo Cristofori, 1726 - YouTube
The Structure of the Piano:What is a Piano's "Action"? - Musical Instrument Guide - Yamaha Corporation
Double escapement - limit cycle - YouTube
Roland FP-4F Digital Piano | zZounds
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File:Britannica Pianoforte Erard Double Escapement Action.png - Wikimedia Commons
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Sébastien Érard & The Double Escapement Action - YouTube
The Pianoforte until the end of the 18th century – The Salon Music Blog
