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Original Fleming two electrode thermionic valve mounted an a mahogany base, used first as a detector in wireless telegraphy, by Sir Ambrose Fleming, England, 1904
Two electrode Fleming thermionic valve, with brass cap, copper second electrode and wooden base, used in 1905 as a detector of electric oscillations in wireless by the Marconi Wireless Telegraphy Co., by Sir Ambrose Fleming, England, 1905