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Keuffel & Esser Log Log Duplex slide rule

Keuffel & Esser Log Log Duplex slide rule

Keuffel & Esser Company
ca. 1915-1923
Keuffel & Esser Polyphase Duplex slide rule

Keuffel & Esser Polyphase Duplex slide rule

Keuffel & Esser Company
circa 1935
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The Collection of Historical Scientific Instruments
Science Center, Room 371 • 1 Oxford Street
Cambridge, MA 02138 •chsi@fas.harvard.edu
p. 617-495-2779 • f. 617-496-5794
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