Triangular Scale Ruler Dietzgen Three-Sided Made in U.S.A. Vintage

Vintage Triangular Scale Ruler Alvin Three-Sided Made in Germany

Alvin 742 PM Triangular Drafting Engineering Scale Ruler Made in Germany

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

12 Inch Aluminum Architect Scale Ruler Triangular Drafting Blueprint Metal

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

Vintage Genuine Boxwood Drafting Ruler Divided Charvoz Made in W Germany

WOODEN PEARWOOD GRAMERCY TRIANGULAR DRAFTSMEN RULER MADE IN W-GERMANY