Vintage Keuffel and Esser Log Log Duplex Slide Rule, Model 4088-3
This is a vintage Keuffel and Esser Log Log Duplex Slide Ruler, model 4088-3. Made in 1930s, the 10" duplex slide rule was constructed on a mahogany wood frame with a celluloid overlay laminated surface.
The rule is in very good condition with little graphic loss. The glass cursor is still clear and with a corner chip. Leather case is included, but in vintage condition with the leather tab loose..
K&E 4088-3 S/N 294331
Made in U.S.A. - All Glass cursor
Patents - Lower Stock: Pat. June 5 '00; Dec 22, '08; Cursor: 8.17.15
Front: DF = CF CIF C = D
Rear: K A = B S T CI = D L
This slide rule has its original ephemera, torn, but survived!