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Some of the earliest Audion AM radio transmitters, built by de Forest around 1916. The invention of the Audion oscillator in 1912 made inexpensive sound radio transmission possible, and was responsible for the advent of radio broadcasting around 1920.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 09:46, 18 September 2022 | | 495 × 255 (115 KB) | Ashish kumar (talk | contribs) |
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