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

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

The C-Thru TS-656 Drafting Ruler 3 Sides Triangular Architect Engineer 12" Vtg

2 Vintage Architect Drafting Rulers Keuffel &Esser (K&E) Paragon, Triangle Ruler

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

Vintage 12" K&E Co Star Quality Triangular Ruler 8881 Three Sided

Triangular Ruler Vintage Wood Dietzgen 31626 Architect 12” U.S. STD

Rare Vtg BRUNING 12" Style C-32 Wooden Drafting Ruler Full & Half Size 1/32”