File:Britannica Pianoforte Wornum Upright Action.png
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 00:53, 27 August 2009 | 372 × 1,030 (14 KB) | Bob Burkhardt | {{Information |Description={{en|1=Robert Wornum's upright piano action of 1826. The original of the now universal crank action in upright pianos.}} |Source=Encyclopædia Britannica, 11th ed., Vol. 21, p. 570 |Author=Robert Wornum |Date=1826 |Permission={{ |
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