Vintage Gramercy 530 Architect Triangular Scale Drafting Ruler West Germany

Vintage Dietzgen No. 31626 Wooden 3-Sided Triangular Scale Ruler--for drafting

Vintage Dietzgen 1656 BP Triangular Scale Ruler Architecture Drafting

Vintage Dietzgen 1509 Scale Ruler Architect Drafting

Vintage DIETZGEN USSTD 1656B Scale Drafting Engineer Ruler Triangular 6 Scales

Vintage Triangular Ruler 12" Dietzgen 1667BP Drafting Engineer Architect

2 Vintage 12" Triangular Scale Drafting Ruler Pearwood and A&E, Germany & USA

Vintage Pearwood Tacro 4846 U.S. ST'D. Architect Scale Drafting Triangular Ruler