File:Britannica Pianoforte Erard Double Escapement Action.png
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 23:45, 26 August 2009 | 943 × 548 (22 KB) | Bob Burkhardt | {{Information |Description={{en|1=Sébastien Érard's double escapement piano action of 1884. The double escapement or repetition is effected by a spring in the balance pressing the hinged lever upwards, to allow the hopper which delivers the blow to retu |
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