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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU142Linear
N4135
4426
n/a
Power ComputingKeuffel & EsserUSA
53581
Engine divided celluloid laminated mahogany
"5"
1923
C6

Notes: Frameless glass indicator with plastic guides. Cursor glass is only 2.0 cm wide instead of more common 2.5 cm wide glass. Rare speciality slide rule for computing power ratings for various kinds of engines.

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