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

Vintage DIETZGEN Master Pro Engineering Drafting Set - Germany U.S. Zone

Dietzgen 1631 Wooden 3-Sided Triangular Ruler Scale Drafting Vintage USA 12"

Vtg Dietzgen Wood Ruler # 31626 USA Drafting , Triangular

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

4 Vintage Dietzgen Wooden Rulers Engineering Drafting USA 2 #1546 #1547 #1581

Vintage DIETZGEN Architects' Scale/Ruler #31626

DIETZGEN Architecht Engine Divided Triangular Scale Ruler Engineer 31626 VINTAGE