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

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

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

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

Vintage Alvin No 280x Boxwood Architect Scale Divided West Germany w/Sleeve

Alvin 12” Triangular Scale Ruler No. 110P Architect Drafting Germany

Vintage Alvin West Germany Triangle Profile Architect's Scale, Excellent