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

Lawrence DeLuxe Slide Rule Lawrence Engineering Service Peru, Indiana

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

Vintage Wood Slide Rule by Lawrence Engineering Service, Peru, Indiana MH

10-B Wooden Slide Rule Lawrence Engineering Service Peru, INDIANA Made In USA

Vintage Lawrence Engineering Service Peru Indiana Slide Rule 10-B Wood USA

Vintage Lawrence Engineering Service Peru Indiana Slide Rule With Case

Lawrence Engineering Service (Peru Indiana) slide rule - vintage 10.5" wood #10B