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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.
In 1933 the FM radio was patented and after the WWII, the FM radio broadcast started in Germany. The first transistor radio was launched in the 1960 by Sony that was powered by the battery and proved to be a hit instantly.