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K & E Polyphase Duplex Decitrig Slide Rule; No. 4071; A Manual
by Kells, Lyman M.; Kern, Willis F.; Bland, Jams R
Hoboken, NJ: Keuffel & Esser Co., 1939. Soft cover. Good/No Jacket. 8vo - over 7¾ - 9¾" tall. 87 pp. with index. Well illustrated with Figures. Orange wraps, stapled. Over lightly worn and soiled; slight tears at staples. Text cl…
