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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU384Linear
4139
4429
1
Cooke RadioKeuffel & EsserUSA
659915
Engine divided celluloid laminated mahogany
"10"
1939
C5

Notes: Improved glass indicator. Special slide rule for making tuned circuit calculations - replaced model 4082-3. No model on this early issue. Cooke Radio Slide Rule logo on right end of back of slide. Patent notation on lower stator on front side.

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