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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU659Cylindrical
N4012
4006
n/a
Thacher CalculatorKeuffel & EsserUSA
6582
Brass with paper scales
"18"
1945
C4

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. This model has the range of each scale labeled on each end."

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