Vintage 12" Keuffel & Esser Co. Engineering/Drafting Ruler

2 Vintage Triangle wood 12" rulers for drafting, architecture, engineering

Triangular Drafting 12”Ruler x Mansfield-Sterling 481 Architect Scale Wooden

Vintage Pickett 340 Engineering/Drafting Ruler 12"

VTG Post U.S. Std. 7301 and 7311 Drafting Engineering Triangular Ruler 12" USA

VTG K&E Paragon Scale Lot 2 12” Engineering Architect Drafting 1631P 1621P USA

Vintage E.B.B. & S. NY Wooden Triangle 12" Engineering/Drafting Ruler

Vintage Sterling metric wooden ruler, likely used for drafting or engineering