| 摘要 |
The subject of the addition relates to the technical field of locking elements in general. According to the addition the shouldered ring 40 is mounted so as to rotate on the centring bearing surface 1b of the support member 1, being shaped so as to be slaved to an elastic return member 8 and indexed angularly so as to cooperate as desired as a function of the positioning of at least one internal arrangement with the means 3 for temporary locking in position corresponding to locking or unlocking the pin 2. <IMAGE>
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