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

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

Vintage Alvin Triangular Scale Ruler 241P Drafting Engineer 12"

Mechanical Architect's vintage Scale Triangle Drafting Ruler WOODEN West Germany

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

Alvin 310A Architects Pocket Scale West Germany Drafting Ruler 6” Plastic NEW

Vintage Alvin 110P Triangle Architect Drawing Scale Ruler 3 Sided