Vintage Ford Metric Machine Drafting Ruler 1/2mm Scale 300mm Double-Sided Metal

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

Vintage Dietzgen No. 31626 Wooden 3-Sided Triangular Scale Ruler--for drafting

K & E Keuffel & Esser 56 3264 & 1631W Drafting Machine Scale 12” Rulers Vintage

Vintage Triangular Architect Drafting Scales 3 Sided Ruler Metal Brass NOS

Dietzgen Wooden 3 Sided Triangular Ruler Scale Drafting Vintage 31626 USA 12"

Vintage Keuffel & Esser K&E 6 Inch Machinist Scale Ruler Model W/Leather Case

Vintage Wooden 3-Sided Triangular Scale Ruler Drafting Tool Architect US Std