Drawing instrument

Details Drawing instrument Drawing instrument

B - Operations, Transporting

43

L

B43L 7/10 (2006.01) B43L 7/00 (2006.01) B43L 7/12 (2006.01) G01B 3/56 (2006.01)

Patent

CA 2082192

TITLE: DRAWING INSTRUMENT ABSTRACT OF THE DISCLOSURE A drawing instrument including two rulers each having a head portion, a circular protrusion formed on one of the head portions, and a circular recess formed in the other head portion for slidable engagement with the circular protrusion, the rulers are guided to rotate relative to each other by the slidable engagement between the circular protrusion and the circular recess.

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