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

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

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".

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

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

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

Alvin Ruler, 12" Wood/Plastic Drafting/Engineers 2-Scale, Boxwood, West Germany