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

Lawrence Deluxe Slide Rule W/ Box Peru Indiana Engineering Service

VINTAGE LAWRENCE ENGINEERING SERVICE WOODEN SLIDE RULE w/Box

Vintage Lawrence Engineering Service Slide Rule Ruler In Box Made in USA

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

Vintage Lawrence Engineering Service Wooden Slide Rule w/leather case 250-BT

Slide Ruler Lawrence Engineering Service Wooden Slide Rule W/ Box USA 1938-1947

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