Set of 2 ALVIN 240B and 241P Architect Scale Drafting Triangular Rulers

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

Alvin 240-P Triangular 12" Architect Scale (West Germany)

Triangular Scale Alvin 240P Architect In Case Germany Professional Plastic

Alvin Professional 12" Triangular Drafting Architects Scale Ruler 240p, in Case

VTG West Germany Alvin 240 P Architect Drafting 12” Triangular Scale Ruler 5799

Vintage ALVIN Triangular Drafting / Engineering Rulers / GERMANY