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Cristofori’s action in its final form

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Cristofori’s action in its final form.png Iron plate for upright pianoforte with Agraffes (Mehlin patents)ThumbnailsThe Erard grand action modified by HerzIron plate for upright pianoforte with Agraffes (Mehlin patents)ThumbnailsThe Erard grand action modified by HerzIron plate for upright pianoforte with Agraffes (Mehlin patents)ThumbnailsThe Erard grand action modified by HerzIron plate for upright pianoforte with Agraffes (Mehlin patents)ThumbnailsThe Erard grand action modified by HerzIron plate for upright pianoforte with Agraffes (Mehlin patents)ThumbnailsThe Erard grand action modified by Herz

 1. Key.
 2. Jack.
 3. Jack-operating spring.
 4. Cushion limiting rebound of jack.
 5. Under-hammer.
 6. Hammer-butt.
 7. Hinge of hammer-butt.
 8. Hammer-shank.
 9. Hammer head.

10. Check.
11. Damper-lifter.
12. Damper-head.
13. Action-beam.
14. Wrest-plank.
15. Tuning pins.
16. Bearing-bridge.
17. String.