Vintage Staedtler-Mars 987 19-34 Engineer Triangle Drafting Ruler 12" Germany

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Staedtler-Mars 987 19-34 Engineer Engineering Scale Triangle Drafting Ruler 12”

Early Staedtler Engineer Ruler-Mars 987 19-34 Plastic/Celluloid?Made in Japan GC

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Staedtler-Mars 12” Triangular Scale Ruler 987 18-34 Engineer Germany Color Bars

Staedtler-Mars 987 18-34 Engineer Rule Scale Ruler Made In Japan

TRIANGULAR WOODEN ENGINEER RULERS C-THRU TS-651 STAEDTLER MARS 987 18-34