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In page Bipolar junction transistor:

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One of the most prominent early uses of the transistor was in consumer products such as the transistor radio which began production in 1954. The use of transistors in handheld radios and would also jumpstart a small Japanese company named Tokyo Tsushin Kogyo K.K. to prominence with its TR-55 transistor radio bearing the name the company would soon change to match: Sony. The follow-on pocket-sized Sony TR-63 and several larger models by other manufacturers cemented the transistor and miniaturized electronics as critical to the new, portable consumer device market for decades to come.[citation needed]