this state of affairs continued until the company's breakup in 1984. Throughout most of the 20th century, AT&T held a semi-monopoly on phone service in the United States and Canada through a network of companies called the Bell System. At this time, the company was nicknamed Ma Bell.

Early radio development

AT&T closely monitored new telephony technologies, although initially for private communication. In 1906, it sent observers to Reginald Fessenden's

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