Archive of Collections



Details and Image



Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU190Linear
N4053-3
4717
2
Polyphase Mannheim AdjustableKeuffel & EsserUSA
417034
Engine divided celluloid laminated mahogany
"10"
1949
C3

Notes: Improved glass indicator. Company/city notation moved to between 2 & 3 on left and the other notations moved between 3 and 5 on right end of slide rule.

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