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Double repetition action of Sebastian Erard as used by S. & P. Erard, Paris

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Double repetition action of Sebastian Erard as used by S. & P. Erard, Paris.png Early form of the regalsThumbnailsCristofori’s action in its final formEarly form of the regalsThumbnailsCristofori’s action in its final formEarly form of the regalsThumbnailsCristofori’s action in its final formEarly form of the regalsThumbnailsCristofori’s action in its final formEarly form of the regalsThumbnailsCristofori’s action in its final form

1. Key.
 2. Wippen.
 3. Jack.
 4. Escapement lever.
 5. Hammer-shank.
 6. Roller.
 7. Hammer-head.
 8. Jack regulating button.
 9. Regulating button to limit rise of escapement lever.
10. Hammer-butt.

11. Check.
12. Felt cushion to engage with check.
13. Sticker connecting key and wippen.
14. Action-rails.
15. Damper-head.
16. Damper operating device.
17. Device to limit travel of jack.
18. String.
19. Spring (v-shaped) for escapement lever and jack.