Vintage Post Boxwood 3-Sided Ruler 7311 Engineering, Drafting

VTG Post U.S. Std. 7301 and 7311 Drafting Engineering Triangular Ruler 12" USA

Vintage - Post - Architects and Mechanical Engineers - 12” Scale Ruler - #7301DH

2 Vintage U.S. ST'D – POST Wood Architect Triangular Drafting Ruler 7311 & 7301

Vintage Post 7301D Boxwood Triangular Scale Ruler 12 Inch Drafting Tool Antique

Vintage Lot 2 Bruning Pocket Drafting Scale Ruler 6" & Dietzgen 5" Sliding Rule

Alvin Ruler, 12" Wood/Plastic Drafting/Engineers 2-Scale, Boxwood, West Germany

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