File:Detector magnetico Marconi 1902 - Museo scienza e tecnologia Milano.jpg - Wikimedia Commons
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Elements of radio telephony . a minimum. Tube Detectors.—The first.vacuum tube detector was theso-called Fleming Valve and consisted only of hot fila-ment and cold plate. Its action was merely that of
Wireless Specialty "Perikon" crystal radio frequency detector | National Museum of American History
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File:Vintage 1920s-Era Crystal Radio With Grewol Detector And ICA Radio Tuner (15401164517).jpg - Wikimedia Commons
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AM and FM Detection
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Wireless Specialty "Perikon" crystal radio frequency detector | National Museum of American History
Telefunkon A Detector Radio, 1925 : Lot 311 | Radio, Old radios, Vintage radio
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Antique Crystal Radio With Tuning Coil And Adjustable Detector Stock Photo - Download Image Now - iStock
The Crystal Detector Radio Set November 1932 1930s Wireless Picture shows lever down and out of contact with crystal Stock Photo - Alamy
3 Simple RF Detector Circuits / Radio Signal Field Detector - YouTube
File:Crystal-Detector Radio Receiver of Exploratory Type 1925.jpg - Wikimedia Commons
Detector Circuits (Part I), August 1945, Radio-Craft - RF Cafe
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Crystal detector - Wikipedia
