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1Pierce, George Washington — ▪ American inventor born Jan. 11, 1872, Webberville, Texas, U.S. died Aug. 25, 1956, Franklin, N.H. American inventor who was a pioneer in radiotelephony and a noted teacher of communication engineering. The second of three sons of a… …
2List of vacuum tubes — This is a list of vacuum tubes or thermionic valves. Before the advent of semiconductor devices, hundreds of tube types were used in consumer and industrial electronics; today only a few types are still used in specialized applications. Contents… …
