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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU464Linear
Mystery
Unknown
1
Mystery Polyphase MannheimKeuffel & EsserUSA
402458
Engine divided celluloid laminated mahogany
"10"
1931
C4

Notes: "Special polyphase mannheim (same scales as model 4053), but with special University of Wisconsin College of Engineering table of constants and formulas oriented horizontally. Frameless glass indicator with plastic guides and protective flaps. Extended frame and slide."

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