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On this day in 1927, the president of the AT&T called the secretary of the General Post Office of Great Britain to test the first commercial telephone line across the Atlantic Ocean.

"Today is the result of many years of research and experimentation. [...] No one can foresee the ultimate significance of this latest achievement of science and organization."

https://www.history.com/speeches/first-transatlantic-telephone-call

https://en.wikipedia.org/wiki/History_of_the_telephone

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