Keuffel & Esser 4092-3  Duplex Log Slide RuleKeuffel & Esser 4092-3  Duplex Log Slide RuleKeuffel & Esser 4092-3  Duplex Log Slide RuleKeuffel & Esser 4092-3  Duplex Log Slide RuleKeuffel & Esser 4092-3  Duplex Log Slide RuleKeuffel & Esser 4092-3  Duplex Log Slide RuleKeuffel & Esser 4092-3  Duplex Log Slide RuleKeuffel & Esser 4092-3  Duplex Log Slide Rule

The Keuffel & Esser Co. was drafting instrument and supply company founded in 1867 by German immigrants William J. D. Keuffel and Herman Esser. This type of rules are mainly use for multiplication, division, and other functions such as roots, logarithms and trigonometry. This type of slide rule were manufactured for specialized fields such as aviation and finance. This rule has 17 scale, Front: K,DF,D,L,B,S,T,C Back: LLO,A, LL3,LL2,LL1,CF,CIF,CI,C This rule has printed in red letters: Keuffel & Esser Co. NY PAT.June 5/00, Dec 22/08, April 1/24. This rule is in very good condition. Just a little damage on the glass cursor, on one side the two corner by the screws are chipped and on the other side on corner is chipped and the other is crack, However the screws still holding the glass firmly and the cursor is in great working condition. This rule comes with the leather case. There is no strap on the leather case. Ca. 1920-30's

ITEM ID
R1369
ITEM TYPE
Vintage

Keuffel & Esser 4092-3 Duplex Log Slide Rule

$85

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