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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 Drums on a summer's eveningThumbnailsDouble PipesDrums on a summer's eveningThumbnailsDouble PipesDrums on a summer's eveningThumbnailsDouble PipesDrums on a summer's eveningThumbnailsDouble PipesDrums on a summer's eveningThumbnailsDouble Pipes

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.