VTG Staedtler Mars 987 18-31 Trianglular Scale Ruler Drafting Architect Engineer

Staedtler-Mars 987 18-31 Architect Scale Triangle Drafting Ruler Made In Germany

Staedtler-Mars 987 18-31 Three-Sided Ruler. Architect with Case Made in Germany

Staedtler Mars 987 18-31 Architect Triangular Scale Ruler 12" Made in Germany

Staedtler-Mars 987 18-31 Architect Scale Triangle Drafting Ruler Made GERMANY

Staedtler-Mars 987 18-34 Three-Sided Ruler. Engineer with Case Nice Condition

Staedtler-Mars 987 18-31 Architect Scale Triangle Drafting Ruler 12" Japan White

Vintage Staedtler Triangular Architect Ruler 987 18-31