K&E Keuffel & Esser Co Decilon Vintage Slide Rule 1947 1961 w/case

Vintage Original Pedigree Precision Slide Rule By Empire Made in USA

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Slide Rule How To Use It Calvin C Bishop Vintage Barnes & Noble Math Guide

KEUFFEL & ESSER CO. K+E Slide Rule with Case

vintage K&E slide rule

Vintage Richardson No 1776 Slide Rule Made in USA