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

Triangular Ruler Vintage Wood Dietzgen 31626 Architect 12” U.S. STD

DIETZGEN Architecht Engine Divided Triangular Scale Ruler Engineer 31626 VINTAGE

Vtg Dietzgen 31626 Drafting Triangular Ruler 12" Wood, USA

Vintage Triangle Ruler - DIETZGEN ENGINE DIVIDED 31626, USA

Lot of 3 Vintage Dietzgen Wood Architect's Triangular Drafting 31626 31636

Vintage Dietzgen 31626 Engine Divided 12" Triangular Scale Ruler

DIETZGEN 31626 ENGINE DIVIDED TRIANGULAR WOODEN RULER