Vintage ALVIN Triangular Drafting / Engineering Rulers / GERMANY

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

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

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

VTG TAMAYA TOKYO Engineering Drawing Triangular Scale Ruler Made in Japan

Vintage Alvin Drafting Kit No 502 Missing Pieces Made in Germany

VTG TAMAYA TOKYO Engineering Drawing Triangular Scale Ruler Made in Japan

306A Alvin 300 Series 6" Professional Architect Aluminum Triangular Scale NEW