Staedtler-Mars 987 19-34 Engineer Scale Triangle Drafting Rule 12" USA /inches

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

STAEDTLER-MARS 987 19-34 Engineer Engineering Scale Triangle Drafting Ruler 12"

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

Staedtler-Mars 987 19-4 Architect Scale Triangle Drafting Ruler White 12" VTG

STAEDTLER 987 19-31 Architect Ruler Eng. Scale Triangle Drafting 12" Japan

STAEDTLER-MARS 987 18-31 Architect Engineering Scale Triangle Drafting Ruler 12"

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