Breckenridge, William E. — The Polyphase Duplex Slide Rule: a Self-Teaching Method.
Førsteudgave
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.
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777321
$10.00 (€9.07 | £7.57 | ¥1,597)