In the first half of the 20supth/sup 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_________ .

Question

In the first half of the 20sup>th/sup> 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 20sup>th/sup> 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 20sup>th/sup> Century, AT&T Used