LOT (5) VTG 12" Engineer Architect Triangular Rulers Helix Hughes-Owens Keuffel

This set of five vintage triangular rulers showcases craftsmanship from brands like Keuffel & Esser and Hughes-Owens. A collector's treasure or useful tool. • Fivetriangular rulers, each 12" long • Includes vintage brands: Helix, Hughes-Owens, Keuffel & Esser, Post, Staedtler • Features detailed metric and imperial scales • Ideal for drafting and engineering Minor wear and discoloration visible. A couple minor chips but no major damage. The cases have absorbed a musty smell from storage over the years.