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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU254Linear
4135
4424
n/a
Power ComputingKeuffel & EsserUSA
36
Engine divided celluloid laminated mahogany
"7.5"
1913
C4

Notes: Rare speciality slide rule for computing indicated horsepower ratings for steam and gas engines and brake horsepower ratings for Prony brakes. No indicator. Duplex slide rule with two slides.

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