DIETZGEN 31626 ENGINE DIVIDED TRIANGULAR WOODEN RULER

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

Dietzgen “31626” Engine Divided Wooden Triangular 12” Scale

Vintage Triangle Ruler - DIETZGEN ENGINE DIVIDED 31626, USA

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

Vintage Dietzgen 31626 Engine Divided 12" Triangular Scale Ruler

Vtg Dietzgen 31626 Drafting Triangular Ruler 12" Wood, USA

Vintage Dietzgen 1656 BP Triangular Scale Ruler Architecture Drafting