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

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

Vintage Genuine Boxwood Drafting Ruler Divided Charvoz Made in W Germany

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

C-Thru Ruler Co TS-656 Architect Engineer 12" Drafting Tool Triangular Tri Color

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

Post Architects And Mechanical Engineers 12” Scale Hardwood Die Engraved 7301DH

Dietzgen Wooden 3-Sided Triangular Ruler Scale Drafting Vintage USA 12" w/Case