Staedtler-Mars 987 18-34 Engineer Rule Scale Ruler Made In Japan

Staedtler-Mars 987 19-34 Engineer Scale Triangle Drafting Rule 12" USA /inches

Ruler Lot Drafting Engineer Rapid Rule Multi-Scale Alvin Staedtler 987 Drawing

DIAL - A - SCALE ARCHITECTURAL ROTATING SCALE, BY RAPID RULE

VTG Lot/4 Keuffel & Esser Slide Rule Triangular Ruler Charvos 612 Drafting Kit

Vtg C-Thru Ruler Co Proportional Scale Circular Slide Rule PS 80 Round USA

Rapid Rule - 6” Drafting / Architecture - Adjustable Rotating Ruler

Vtg C-Thru Ruler Co Proportional Scale Circular Slide Rule PS 69 5" Round USA