Vintage Triangular Ruler K+E Paragon Engineers' Triangular Scale 12 In.

Keuffel & Esser 12” Inch Triangular Scale Ruler 56 3648 Paragon Germany

Vintage K&E Triangular Scale Ruler Wood w/ Original Case 1940s-50s 12,5”

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

Vintage Keuffel & Esser Paragon 1631P Triangular Scale Drafting Ruler

Kieffell & Esser Paragon Ruler - Model 56-3276- G/VGC - Pre-Owned - Initials 12”

Vintage A.W. Faber Castell 873C/b Made In Germany Triangle Ruler Original Box