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The development of radio technology during the late nineteenth and early twentieth centuries was shaped not only by technical invention but also by patents and licensing agreements. Key technologies—including wireless transmission systems, vacuum tubes, and receiver circuits—were protected by patents held by individual inventors and large electrical manufacturers. As commercial broadcasting emerged in the 1920s, many of these patents were consolidated through licensing pools and cross-licensing agreements among companies such as the Radio Corporation of America (RCA), General Electric, Westinghouse, and AT&T. These arrangements strongly influenced which firms could manufacture radio equipment and played a major role in structuring the early radio industry.
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