Alvin No. 110P Precise Triangle Architect Drafting Scale Ruler West Germany 12"

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

Architect Triangular Scale Ruler 12" Model 110P White with Black Graduations, Ar

Alvin 110-P Triangular 12" Architect Scale (West Germany)

Vintage Alvin Triangular Scale Ruler No 110 P Architect 12" West Germany

Alvin No. 110P Precise Triangle Architect Drafting Scale Ruler West Germany 12"

Alvin No. 110P Precise Triangle Architect Drafting Scale Ruler West Germany 12".