Vintage LAWRENCE Deluxe SLIDE RULE 10-B, Lawrence Engineering Peru, Indiana USA

Lawrence Engineering Service Slide Rule Peru Indiana

Lawrence DeLuxe Slide Rule Lawrence Engineering Service Peru, Indiana

Vintage Lawrence Engineering Service Deluxe Slide Rule, original box Made in USA

Lawrence Engineering Service Wooden Slide Rule - Peru, INDIANA Ruler USA

Vintage Lawrence Engineering Service Wooden SLIDE RULE w/ Original Box Peru, IN

OLD WOOD SLIDE RULE LAWRENCE ENGINEERING PERU, INDIANA OWNED BY MJ BAKIRAKIS

Vintage Lawrence Engineering Service, Peru, Indiana Made in USA Slide Rule