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A transistor radio is a small portable radio receiver that uses transistor-based circuitry. Following their development in 1954, made possible by the invention of the transistor in 1947, they became the most popular electronic communication device in history, with billions manufactured during the 1960s and 1970s.
1 On Feb. 22, 1924 Calvin Coolidge became the first president to make a public radio address to the American people. 2  President Coolidge later helped create the Federal Radio Commission, which has now evolved to become the Federal Communications Commission (FCC).