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TK-System parallel ruler for drawing board DIN A3
TECHNICAL DRAWING GENERAL SCALE RULER #7539 - Trefoil
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Trefoil Technical Drawing School Scale Ruler
Technical drawing tools The ruler The graduated ruler is the most common tool used for making straight lines and to measure distances. It has a bevelled. - ppt download
Ruler | MAU ART & DESIGN GLOSSARY|Musashino Art University