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Details and Image



Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU043Linear
68-1617
4119
n/a
Polyphase Mannheim AdjustableKeuffel & EsserUSA
130440
Engine divided celluloid laminated mahogany
"10"
1969
C4

Notes: Narrow unbreakable indicator. Model number changed to new number system (68 to designate slide rule and 1617 to designate unique model number). Trig scales subdivided in minutes.

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