The Pickett Model N4-ES is a vintage slide rule that was manufactured in Chicago, USA between 1958 and 1962:
Features: The Pickett Model N4-ES is a vector-type log log dual-base speed rule with aluminum stock, square braces, extended nylon cursor bars, and a flat lens. The front of the slide has scales for CF, CIF, double T, ST, S, CI, and C.
Identification: The left end of the slide is marked with MODEL N4-ES (/) Vector-Type LOG LOG (/) DUAL-BASE SPEED RULE . The right end has Pickett in script on a triangle with a dot at one point, and MADE IN U.S.A. appears beneath the logo
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