| 摘要 |
The rear end of the lead (40) and or an element (42) connected to the lead so as to plot the position of the lead in relation to the sleeve (12) is visible from outside if the plotter reaches a pre-set amount. The lead is made of softenable material. A viewing window (48) has two or more optically separated parts (50,52,54). The plotter has a spindle (26) held in a handle (10) and in the sleeve which, when turned moves axially in relation to the handle part.
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