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

Vintage Keuffel & Esser Paragon Drafting Tools + Wood-Regan 2-Piece Ruler Set

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

Vintage Keuffel & Esser Paragon 1631P Triangular Scale Drafting Ruler

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

Vintage Keuffel & Esser Paragon 1631P Triangular Scale Drafting Ruler

Keuffel & Esser Triangular 12” K&E Drafting Scale Ruler 56 3648 Paragon Germany

Staedtler-Mars 12” Triangular Scale Ruler 987 18-34 Engineer Germany Color Bars