UNIVERSAL INSTRUMENT FOR DRAWING MATHEMATICAL SHAPES

摘要

Novelty: Universal instrument for drawing mathematical shapes. Constitution: A rectangular plate made of flexible translucent or opaque plastic material having peripheral incised lines and an internal engraved frame having holes at its four corners and a semi-cycle furnished with holes and engraved letters (lines and letters being either printed or in relief). Purpose: Easy and fast drawing of basic geometrical shapes and graphic representations.