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Red hot again. Vacuum tubes fizzled out in the 1960s thanks to the invention of the transistor, but new research could fire-up the technology once more. Credit: Shane Gorski/Creative Commons

Mobiltel Automatic by Automatic Electric 1958  In 1956, the world’s first partly automatic car phone system, Mobile System A (MTA), was launched in Sweden. MTA phones were composed of vacuum tubes and relays, and had a weight of 88.2 pounds  Automatic Electric: (AE) telephone equipment supplier for independent telephone companies, comparable to the Bell System’s Western Electric

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