The utility model is composed of a central shaft road, a turning block, and a scribing needle.
本实用新型是由中心轴杆、转动滑块和划针组成。
A slidable caliper head is additionally arranged on the scribing feet combined with the fixed plate, and the caliper head is provided with an adjustable scribing needle.
在与固定板结合的划脚上增加了一个可滑动的卡尺头，卡尺头上有一可调划针。
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