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

Dietzgen Wooden Triangular Scale Drafting Ruler 31626

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

DIETZGEN 31626 ENGINE DIVIDED TRIANGULAR WOODEN RULER

Dietzgen “31626” Engine Divided Wooden Triangular 12” Scale

Vintage Triangle Ruler - DIETZGEN ENGINE DIVIDED 31626, USA

Vintage Dietzgen No. 31626 Wood 3-Sided Triangular Scale Ruler

Vtg Dietzgen 31626 Drafting Triangular Ruler 12" Wood, USA