Vintage Gramercy 530 Architect Triangular Scale Drafting Ruler West Germany

Vintage Architect's 12" Triangular Plastic Scale Ruler ~ Made in U.S.A.

Staedtler Mars Architect Scale Ruler 987 19-31 Triangular Drafting Scale Japan

Tacro SCALE Drafting 3 Sided RULER NO. 4857 ENGINEER Triangular Made In Japan

Staedtler Mars 987‑18‑31 Architect Triangular Scale Ruler – Made in Japan

Tacro SCALE Drafting 3 Sided RULER NO. 4857 ENGINEER Triangular Made In Japan

Vintage Architect Triangle 3 Sided Drafting Ruler Scale POST 1301P Made in USA

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