Vintage Alvin Triangular Drafting Graphic Ruler, Germany, 744PM

Aluminum Triangular Architect Ruler w/Laser-Etched Imperial Drafting Scales 12"

Alvin - 30ATS - Mini Aluminum Architect Triangular Scale Ruler - NEW

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

Vintage ALVIN Triangular Drafting / Engineering Rulers / GERMANY

Alvin 247P Metric Triangular Drafting Scale Ruler (30 cm / 11.81"). Germany

Alvin 3 Sided Engineer Scale Ruler No 119 PC Triangular Drafting Architect 12"

Alvin 12" Triangular Drafting Architects Scale Ruler 247, in Case, Boxwood