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Details and Image



Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU508Linear
4041F
4657
n/a
Mannheim AdjustableKeuffel & EsserUSA
50
Engine divided celluloid laminated mahogany
"10"
1909
C6

Notes: Graduated as finely as a 50 cm slide rule (e.g. 4051). Pi (?) gauge mark added. No model number.

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