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Zoe Martin——Studied at the University of British Columbia, Lives in Vancouver, Canada.
In the 1920s, radio was first used to transmit pictures visible as television. During the early 1930s, single sideband (SSB) and frequency modulation (FM) were invented by amateur radio operators. By 1940, they were established commercial modes.read more >>+119962023-05-02 23:01:01
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