Vintage Dietzgen 11626 11636 Triangular Architect Engineer Scale Rulers USA 12in

Staedtler Mars Masterbow Drafting Set Germany, Slightly used Condition 550 01 N

Lot Of 4 Vintage Architect's / Engineer's 6" Advertising Scale Rulers, Nice

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

Alvin No. 110P Precise Triangle Architect Drafting Scale Ruler West Germany 12".

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

Vintage Drafting Architect Scale Rulers Slide Scales ~ Sewer Rules +++

Alvin 3 Sided Engineer Scale No 119 PC Triangular Drafting Ruler W-Germany