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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU563Linear
n/a
4584
2
AmericanKeuffel & EsserUSA
18
Engine divided celluloid laminated boxwood
"10"
1900
C7

Notes: Adjustable version of American slide rule with three adjustment screws on the upper rail. PAT APPD FOR added to slide well. Inch scale numbers on frame below indicator groove. Edge of rail is squared off. Indicator glass is damaged.

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