Vintage Engineering Instruments Inc Drafting Slide Rule Peru Indiana USA

Engineering Instruments Inc Slide Rule Peru, Indiana USA Wood

VTG Engineering Instruments Inc Slide Rule Ruler 10” Peru Indiana USA With Case

Vintage Engineering Instruments Inc 10” Wood Slide Rule Peru, Indiana- USA (bal2

Vintage Slide Ruler Engineering Instruments Inc. Peru Indiana Made In USA

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

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

Engineering Instruments Inc WOODEN Slide Rule Peru, Indiana Vintage USA (10")