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

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 Scale Triangle Drafting Ruler White 12" VTG

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

Staedtler-Mars 987 19-34 Architect Engineer Scale Triangle Drafting Ruler

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

2-STAEDTLER-MARS 987 19-34 & 19-31 Engineer & Architect Triangle 12” Ruler