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Detector Circuits (Part I), August 1945, Radio-Craft - RF Cafe
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File:Vintage 1920s-Era Crystal Radio With Grewol Detector And ICA Radio Tuner (15401164517).jpg - Wikimedia Commons
Telefunkon A Detector Radio, 1925 : Lot 311 | Radio, Old radios, Vintage radio
Marconi magnetic radio frequency detector | National Museum of American History
Detector (radio) - Wikipedia
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Who Invented Radio: Guglielmo Marconi or Aleksandr Popov? - IEEE Spectrum
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File:Crystal-Detector Radio Receiver of Exploratory Type 1925.jpg - Wikimedia Commons
Detector (radio) - Wikipedia
The Creative Science Centre - by Dr Jonathan P. Hare
Radio Detector Development (1917)
Gecophone crystal detector radio set no. 1, 1923 | Science Museum Group Collection
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Plate detector (radio) - Wikipedia
The Unit Crystal Detector Radio part GEC, General Electric Co Ltd | Radiomuseum
