ALVIN Triangular Scale Ruler 740 PM Vintage Architect Draft Engineering Germany

12 Inch Aluminum Architect Scale Ruler Triangular Drafting Blueprint Metal

Alvin 742 PM Triangular Drafting Engineering Scale Ruler Made in Germany

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

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

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

Charvoz MTS-201 Boxwood Vintage Architect Scale Wooden Triangular Ruler Germany

Alvin 742 PM Triangular Drafting Engineering Scale Ruler Made in Germany