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Details and Image



Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU012Linear
4070-3
4566
n/a
Polyphase Duplex TrigKeuffel & EsserUSA
313487
Engine divided celluloid laminated mahogany
"10"
1957
C4

Notes: Exposed mahogany on edge of slide rule with celluloid strip down the middle. Serial number moved to left side of slide reverse right of bracket with last three numbers on upper and lower stator.

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