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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU418Linear
N4053-2
4687
n/a
Polyphase Mannheim AdjustableKeuffel & EsserUSA
1574
Engine divided celluloid laminated mahogany
"8"
1922
C5

Notes: Frameless glass indicator with celluloid/plastic guides. K scale moved to front of slide rule below D scale. Scale labels moved to left side. Model number moved to right side and N added (N<4053-2>). Notations moved above A scale and MADE IN U.S.A. added.

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