VINTAGE K & E KEUFFEL & ESSER 6" 1630 P PARAGON RULE, DRAFTING SCALE

Vintage DIETZGEN USSTD 1656B Scale Drafting Engineer Ruler Triangular 6 Scales

Vintage 12" PICKETT P-232E-ES Triangular Drafting Architects Scale Ruler

Vintage Dietzgen 1509 Scale Ruler Architect Drafting

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Vintage Keuffel & Esser Paragon 1631P Triangular Scale Drafting Ruler

Keuffel & Esser KE 56 3276 METRIC Paragon Drafting Scale 30cm Drafting Ruler

Vintage Keuffel + Esser Triangular Drafting Scale Ruler 56 3656 W/ Case 12”