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Dietzgen 1626 Wooden 3-Sided Triangular Ruler Scale Drafting Vintage USA 12" Woo

12 Inch Aluminum Architect Scale Ruler Triangular Drafting Blueprint Metal

Vintage 1960s Set Of 2 B. K. Elliott Co Drafting French Curves; NOS; USA

Dietzgen 1626 Wooden VTG 3 Sided Triangular 12" Ruler Scale Drafting Vintage USA

Vintage Bruning 2126P Triangular Engineer Scale Ruler 12” Drafting Tool

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

KEUFFEL & ESSER TRIANGULAR ENGINEER DRAFTING RULER VINTAGE USA