| 摘要 |
The invention concerns the structure of a timepiece movement, more particularly the structure of the hour wheel (1), the inside of whose pipe (4) includes an annular bulge (6) co-operating with an annular groove (22) arranged on the outer wall of the pipe (21) of the cannon-pinion (7). Thus, the hour wheel is snap-fitted onto the movement, without it being necessary to provide an additional part for this purpose, and its toothed wheel (3) cannot therefore be released from the motion-work pinion (19) during transport of the movement.
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