Author: Breckenridge, William E.
Title: The Polyphase Duplex Slide Rule: a Self-Teaching Method.
Description: Keuffel & Esser, 1922. 1922. 1st Edition. Soft cover. First printing. 81 pp. ills. formulae, 8vo, card covers. Fair copy with both covers chipped and detached but present. Interesting, early manual.

Keywords: SLIDE RULES


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