Vintage Triangular Scale Ruler Dietzgen Three-Sided Made in U.S.A.

Vintage Sterling Architect Scale White Plastic Triangular 12" Ruler

Architectural Scale Ruler 12” Plastic Triangular Drafting Tool for Engineers

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

Dietzgen 1631 Wooden 3-Sided Triangular Ruler Scale Drafting Vintage USA 12"

Dietzgen 1626 Wooden VTG 3 Sided Triangular 12" Ruler Scale Drafting Vintage USA

Engineer Triangular Scale 12" Ruler with Etched Marking made in Japan

Vintage Sterling Architect Scale White Plastic Triangular 12" Ruler