Author: Breckenridge, William E.
Title: The Polyphase Slide Rule. A Self Teaching Manual with Tables of Settings and Gauge Points.
Description: Keuffel & Esser. New York & Hoboken 1925 1st edition. Buff printed card wraps. 83pp 0.1kg. Signature to front wrap, saddle stapled covers parting, hence A Good only copy.

Keywords: slide rules


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