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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU658Linear
4075
4198
n/a
Duplex w/2 SlidesKeuffel & EsserUSA
15
Engine divided celluloid laminated mahogany
"10"
1901
C5

Notes: "Early duplex slide rule with interchangeable slides. Chisel tooth metal indicator. One slide has trig scales on reverse and the other has inverted scales. All scales labeled on right hand side and has KEUFFEL & ESSER Co. NEW-YORK on obverse and PAT. OCT. 6. 1891 on reverse, both below D scale between 2 and 3."

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