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Keuffel and Esser Log Log Duplex Vector 4093-3 10" Linear slide rule
IN-1964
Keuffel & Esser Co.
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Keuffel and Esser Log Log Duplex Decitrig 4081-3 10" Linear slide rule
IN-1971
Keuffel & Esser Co.
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Keuffel and Esser Log Log Duplex Decitrig 4081-3 10" Linear slide rule
IN-2100
Keuffel & Esser Co.
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Keuffel and Esser Polyphase Mannheim 4053-3 10" Linear slide rule
stray114616
Keuffel & Esser Co.
circa 1917
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