Fleming's Diode Valve 1904. The Fleming valve, also called the Fleming oscillation valve, was a vacuum tube (or "thermionic valve") invented in 1904 by John Ambrose Fleming as a detector for early radio receivers used in electromagnetic wireless telegraphy
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Image Number: 1746-21131550Rights ManagedCredit Line:SuperStock / Image Asset ManagementCollection: Image Asset Management Model Release:NoProperty Release:NoResolution:5167×4058
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