Vintage Engineering Instruments Inc. Slide Rule w/ Case – Peru, Indiana USA

Vintage Richardson No 1776 Slide Rule Made in USA

Vintage Engineering Instruments Inc Drafting Slide Rule Peru Indiana USA

Vintage Engineering Instruments 250-V Slide Rule Peru Indiana

Lawrence Slide Rule Vintage Made In The U.S.A With Box

Engineering Instruments Inc Slide Rule Peru, Indiana USA Wood

Vintge Engineering Instruments Inc Slide Rule; C,D,CI,A,B,K Scales; Made Peru,IN

Lawrence Engineering Service Vintage 10-B Wood Slide Rule