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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU078Linear
4070-3
4185
n/a
Polyphase Duplex TrigKeuffel & EsserUSA
638023
Engine divided celluloid laminated mahogany
"10"
1939
C5

Notes: "Later version of 4070 with new scale set. Trig scales subdivided in degrees and minutes. Patent notation: PAT.1,930,852 PAT.PEND."

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