Keuffel & Esser (K&E) 4075, PN70 Mahogany Duplex slide rule. Comprised of two-sided white celluloid coated mahogany, brass framed chisel cursor with 2 points on both sides, and metal end pieces. This model is an early form of the old 4071 family shown in the 1901 and 1903 catalogs. Marked "Pat. Oct. , 1891." 11 1/4" H x 1 1/8" W. Provenance: Private West Tennessee Collection. CONDITION: Overall good condition. Minor scuffs, wear commensurate with age and use.
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