C-Thru PS-80 Proportional Scale Drafting Tool Ruler Company Bloomfield CT USA

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

C-Thru Ruler Co PS-80 Proportional Scale for Image, Drafting, Graphic Design

PS 69 Proportional Scale, C-Thru Ruler Company, made in USA Vintage

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