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Transistor radio
The world's first transistor radio, the Regency TR-1 from Industrial Development Engineering Associates in Chicago. TI engineers built a prototype in four days in 1954, and the two companies then further refined the design. The final version, released Oct. 18, 1954, measured 5 x 3 x 1.25 inches and was the smallest radio yet produced.

Although it brought recognition, the TR-1 didn't make much money. To avoid alienating customers, the radio sold for $49.95. Other transistor radios quickly followed.

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