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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 the 1940s, radio was the electronic medium for family entertainment and information. In the 1950s, it was television that was the new medium and it rapidly became global, bringing visual entertainment, first in black and white, then in colour, to the world.