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Details and Image



Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU560Linear
4053-3
4109
n/a
Polyphase Mannheim AdjustableKeuffel & EsserUSA
566X
Engine divided celluloid laminated mahogany
"10"
1921
C5

Notes: "Frameless glass indicator with celluloid/plastic guides without notch on lower edge. K scale moved to front of slide rule below D scale; company, patent, etc. notation moved above A scale; cm scale added to lower edge numbered 0-25. No MADE IN U.S.A."

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