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Details and Image



Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU144Linear
N4080-3
4211
n/a
Log Log Duplex TrigKeuffel & EsserUSA
452294
Engine divided celluloid laminated mahogany
"10"
1949
C6

Notes: "Major scale change: L and LL1 scales moved to reverse side below D scale. LL0, LL00, and DI scale removed from reverse of slide rule. LL01 and K scale added above A scale on reverse side. All notations and model number moved to top edge. Scale legends added to right end of slide. N added to model number. "

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