Author: KELLS, LYMAN M.; KERN, WILLIS F.; BLAND, JAMES R.
Title: The LL Trig Duplex Slide Rule No. 4080, A Manual
Description: NY, Keuffel & Esser. 1937. Soft Cover, 8vo. Original softcover. Published NY: Keuffel & Esser, 1924. 8vo. wrappers, 101pp. illustrations, tables and figures throughout. Stapled wrappers with printed salmon card covers. Light pencil bracketing in margins of few pages, short, closed tear at one page corner. Very good. Very Good/No Jacket, As Issued.

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