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File:Vintage 1920s-Era Crystal Radio With Grewol Detector And ICA Radio Tuner (15401164517).jpg - Wikimedia Commons
Who Invented Radio: Guglielmo Marconi or Aleksandr Popov? - IEEE Spectrum
Crystal detector - Wikipedia
3 Simple RF Detector Circuits / Radio Signal Field Detector - YouTube
Wireless Specialty "Perikon" crystal radio frequency detector | National Museum of American History
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Detector (radio) - Wikipedia
Detector Circuits (Part I), August 1945, Radio-Craft - RF Cafe
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File:Crystal-Detector Radio Receiver of Exploratory Type 1925.jpg - Wikimedia Commons
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Gecophone crystal detector radio set no. 1, 1923 | Science Museum Group Collection
