| 摘要 |
Device characterised in that a feeler finger, aligned approximately parallel with the axis of the tubes, is fastened to an articulation part 3, in that there is provided, on the other articulation part 2, a control member which, in a manner known per se, is formed from at least one switch which can be actuated by means of a pivoting operating lever 14, and in that the operating lever 14 is connected functionally to a sensor which is applied against the feeler finger and which transmits to the operating lever the horizontal pivoting movements of the feeler finger. <IMAGE>
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