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 3 Sided Engineer Scale Ruler No 119 PC Triangular Drafting Architect 12"

2 Engineer & 1 Architect 12" Triangular Drafting Scale Rulers Alvin W.T. Rogers

Vintage Alvin No. 241 P Engineer Triangular 12" Scale

Alvin 742 PM Triangular Drafting Engineering Scale Ruler Made in Germany

Vintage Alvin No. 241 P Engineer Triangular 12" Scale

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