| 摘要 |
The rear end 8 of the push-button 3 is provided with blades 15 which can be elastically deformed in the transverse direction when a traction force F is exerted on this button, these blades having sloping faces 10 terminating in a width D1 which is greater, when idle, than the width Do of the opening 2 which contains the button, so that the latter can be extracted through the front of the wall 1. <IMAGE>
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