Vintage Alvin No. 241 P Engineer Triangular 12" Scale & One Unbranded

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

Alvin 3 Sided Engineer Scale No 119 PC Triangular Drafting Ruler W-Germany

Vintage Alvin EB-310 Scale Lot 11 w Cases Engineering Math Tools NOS

VINTAGE-ALVIN ENGINE DIVIDED-No 267-2 SIDED RULER-U.S. ST’D-W.GERMANY Boxwood

Alumicolor 12" Engineer Solid Drafting Scale Code 123 - EXC COND

Vintage Alvin No. 241 P Engineer Triangular 12" Scale

Engineers 12” Triangular Scale No. 241P Germany