Vintage Keuffel + Esser Triangular Drafting Scale Ruler 56 3648 W/ Case 12”

Vintage K&E Doric 56 3850 Triangular Wood Engineer's Scale Ruler 12"

Keuffel & Esser Co. “Doric” N8883 Triangular 12" Engineer’s Scale (ca. 1940s)

Vintage K&E Keuffel Esser 1665W Drafting Machine Scale Ruler 12"

Vintage Keuffel & Esser Paragon 1631P Triangular Scale Drafting Ruler

Wood K&E Keuffel & Esser Triangle Scale Ruler Drafting 12" Length Vintage

Vintage Keuffel & Esser 12" Drafting Scale Ruler 60 0522-2

Vintage KEUFFEL & ESSER K+E 12" Wooden Metric Scale Drafting Ruler