Vintage ALVIN Triangular Drafting / Engineering Rulers / GERMANY

Alvin 3 Sided Engineer Scale No 119 PC Triangular Drafting Ruler W-Germany

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

Alvin - 30ATS - Mini Aluminum Architect Triangular Scale Ruler - NEW

306A Alvin 300 Series 6" Professional Architect Aluminum Triangular Scale NEW

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

Alvin 12" Triangular Drafting Architects Scale Ruler 247, in Case, Boxwood

Aluminum Triangular Architect Ruler w/Laser-Etched Imperial Drafting Scales 12"