Vintage ALVIN 12" Triangle Ruler #241B

Engineers Ruler Set-Vintage 12" Triangle Wood & Plastic 6"-US ST'D-Alvin Italy

Alvin No. 110P Precise Triangle Architect Drafting Scale Ruler West Germany 12".

Vintage Alvin Architect Boxwood U.S.ST’D England Triangle Wood Ruler

Vintage ALVIN Triangular Drafting / Engineering Rulers / GERMANY

Vintage E.B.B. & S. NY Wooden Triangle 12" Engineering/Drafting Ruler

Lot of 2 Alvin Triangle Scale Ruler Architect Germany 110P Pickett P-232E Japan

Alvin 241B Engineer Scale 12in Triangular Drafting Eng Chain Scale Ruler Plastic