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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU199Linear
4101
4392
1
StadiaKeuffel & EsserUSA
10
Engine divided celluloid laminated mahogany
"20"
1906
C5

Notes: Early stadia model without indicator. No model number. Celluloid laminate in slidewell with patent notation. Instruction on back runs length of slide rule. No scales on reverse of slide.

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