In the first half of the 20^th century, AT&T used vacuum tubes to construct amplifiers that made long distance telephone calls possible. AT&T funded research to develop a semiconductor replacement to the vacuum tube. The research resulted in the invention of the .

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The Answer of In the first half of the 20^th century, AT&T used vacuum tubes to construct amplifiers that made long distance telephone calls possible. AT&T funded research to develop a semiconductor replacement to the vacuum tube. The research resulted in the invention of the .

In the First Half of the 20th Century, AT&T Used

In the First Half of the 20^th Century, AT&T Used