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

Vintage ALVIN Triangular Drafting / Engineering Rulers / GERMANY

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

Vintage Alvin Triangular Drafting Graphic Ruler, Germany, 744PM

vintage triangular Drafting Ruler Henschel co. No. 971P Germany 12" w/ case