Author: Goddard, Fred
Title: The four-electrode valve.
Description: London, Mills and Boon, 1927. 106 pp. hard cover. Illustrated with black and white diagrams. Sdescription G. Insect damage to covers, endpapers browned with two small stains on front, page edges a little soiled, overall good condition. No Jacket.

Keywords: four-electrode valve, wireless, wireless valves


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