Archive of Collections

Archive of Collections

Details and Image

Item#	Type	Model No.	Match No.	Variant No.	Model Name	Maker	Country	Production or Serial No.	Material	Scale Length	Date	Condition
KEU144	Linear	N4080-3	4210	1	Log Log Duplex Trig	Keuffel & Esser	USA	452294	Engine divided celluloid laminated mahogany	"10"	1949	C6

Notes: "Major scale change: L and LL1 scales moved to reverse side below D scale. LL0, LL00, and DI scale removed from reverse of slide rule. LL01 and K scale added above A scale on reverse side. All notations and model number moved to top edge. Scale legends added to right end of slide. N added to model number. 4 patents and PATS.PEND."

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