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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU095Cylindrical
4012
4005
n/a
Thacher CalculatorKeuffel & EsserUSA
4145
Brass with paper scales
"18"
1919
C5

Notes: "Cylinder mounted inside a cage with paper scales, brass stand, and mahogany base. Resolution of calculations equivalent to a linear slide rule 720" long."

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