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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU427Linear
4065T
4174
1
Duplex TrigKeuffel & EsserUSA
6
Engine divided celluloid laminated mahogany
"8"
1909
C5

Notes: "Metal framed glass "clamshell" indicator. C-shaped brackets facing out. L scale on top edge; S & T trig scales on slide front and back respectively. KEUFFEL & ESSER CO N.Y. on front; PAT.OCT.6.1891. on reverse. T added to model number (i.e. <4065T>."

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