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Details and Image



Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU274Linear
D68-1617
4550
n/a
Polyphase Mannheim AdjustableKeuffel & EsserUSA
960135
Engine divided celluloid laminated mahogany
"10"
1966
C0

Notes: Narrow unbreakable indicator. Model number changed to new number system (68 to designate slide rule and 1617 to designate unique model number). D in model number denotes the decimal divided trig scales.

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