Set Of ALVIN 240P & 241P Architect & Enginer Scale Drafting Triangular Ruler

Vintage Triangular Scale Ruler Lot - Pickett P-232A Architect & Alvin No. 241P E

ALVIN No. 241 P Architect Scale Drafting Triangular Ruler Engineer Germany + Box

ALVIN No. 240B Architecture Drafting/ Design Triangle Ruler Made in Germany

Alvin 117 PM Metric Drafting Triangle Ruler In Case Plastic. Germany

Vtg Alvin Triangle 3 Sided Engineer Ruler MADE IN GERMANY No. 241P

Alvin 12” Triangular Scale Ruler No. 241P Engineer U.S. ST'D Germany Color Bars

Vintage Alvin No. 241 P Engineer Triangular 12" Scale