Multi-purpose vision protection ruler
A technology of static ruler and dynamic ruler, applied in the direction of ruler, mechanical device, printing, etc., to achieve the effect of improving learning and work efficiency, low cost and simple structure
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[0013] Static ruler 1 is fixed on the book with commercially available iron clips, just can use. The lower part of static ruler 1 is flange 4, and its function is to make it close to the book; the purpose of two bosses 3 on one surface of static ruler 1 is: when fixing static ruler 1 with commercially available iron clips, it plays a positioning role. The role of iron clips. The moving ruler 2 slides back and forth on the static ruler 1 through a pair of dovetail grooves, so that the linear dimensions in the horizontal and vertical directions can be measured simultaneously.
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