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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU172Linear
4088-2
4294
n/a
Polyphase DuplexKeuffel & EsserUSA
4
Engine divided celluloid laminated mahogany
"8"
1913
C7

Notes: "8" version of polyphase duplex sliderule. Metal framed glass "column" style indicator. Patent notation above DF scale on left end."

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