| 摘要 |
An arm holds a pallet jewel against a ratchet wheel which is thinner than the pallet jewel, and the arm is fitted with fingers which lie on either side of, but do not touch, the ratchet wheel. In case of mechanical shock to the system in a direction transverse to the ratchet wheel, the fingers come into contact with the face of the wheel and prevent disengagement of the jewel from the wheel.
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