Vintage Architect's 12" Triangular Plastic Scale Ruler ~ Made in U.S.A.

Architectural Scale Ruler 12” Plastic Triangular Drafting Tool for Engineers

Vintage 12" STAEDTLER MARS 987 19-31 Triangular Drafting Architects Scale Ruler

Vintage Architects Scale Drafting Triangular Ruler Engineer 12" Lot of 6

Vintage 12" PICKETT P-232E-ES Triangular Drafting Architects Scale Ruler

Alvin 12" Triangular Drafting Architects Scale Ruler 247, in Case, Boxwood

Vintage Staedtler Mars 12" Triangular Metric Ruler Scale White 987 18-34 JAPAN

Keuffel & Esser Doric All-Plastic Triangular Scale Architect's Ruler 12 Inch