| 摘要 |
A marker having three parts: an annular, enveloping body that is fixed in the location of the mold; and an equally annular intermediate body that is rotatably mounted inside intermediate body and which can rotate relative to the body. Each of these three parts is provided with a signal. Two narrow annular locations are disposed in the area of the marker opposite the operative front, where a helical spring ending in a lug is placed in each of the locations. The lug of the outer spring is the single actuation control of the marker while the lug of the inner spring exhibits play in a small location of the intermediate body. Both springs are oppositely coiled in such a way that strangling of one of the springs takes place simultaneously while the other spring is being released.
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