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

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Vintage Keuffel & Esser Paragon 1631P Triangular Drafting Ruler READ & PHOTOS

VTG K&E Paragon Scale Lot 2 12” Engineering Architect Drafting 1631P 1621P USA

Ruler Pickett P-232A Triangle Engineer Mathematical Scale Vintage

Vintage Keuffel & Esser Paragon 1631P Triangular Scale Drafting Ruler

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Vintage 1631W KEUFFEL & ESSER 12" Triangular Scale Drafting Ruler w/Bruning box