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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.
Before that historic broadcast, radio had played a big role in Coolidge's victory in the 1924 presidential election. The night before the election, Coolidge made history when the largest radio audience ever tuned in to the broadcast of his final campaign speech.