VINTAGE P.I.C. A.G.THORNTON 121 SLIDE RULE & CASE

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Faber Castell Ruler No 57/87 Vintage School Slide Rule for Draughing Drawing

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VINTAGE BOOTS RINGPLAN 15 CM - 10" Long Log Slide Rule with Instructions & Case

Slide rule Vintage technology Historic calculator Sun Hemi Japan Half boxed

Vintage Acumath 400 Slide Rule Made In USA Engineers Ruler