Keuffel & Esser Co. 1375T-1 Drafting 12-1/2" Machine Scale Ruler Clear Plastic

Vintage Keuffel & Esser 1375P-15 Paragon Drafting Machine Scale Ruler 12” Wood

Vintage Keuffel & Esser Paragon Drafting Machine Scale Ruler 6" Wood

Vintage Keuffel & Esser 1375P-2 Paragon Drafting Machine Scale Ruler

Vintage Keuffel & Esser 1375T and 1376T-2 Paragon Drafting Machine Scale Rulers

Vintage Keuffel & Esser 12" Drafting Scale Ruler 60 0522-2

KEUFFEL & ESSER K&E Paragon Wood Plastic Drafting Engineers Scale 60 0512-19 Box