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5min chapter
Phone Tones
Twenty Thousand Hertz
Introduction
The sound of a number being dialed on a telephone is instantly recognizable. Nowadays, how often do you really hear those sounds? At the time in the early 1900s, late 1800s, the United States was largely a grarian, rural country. AT&T struck a deal with the federal government to provide phone service throughout all of the U.S., Canada and Mexico.
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