On This Day in Telephone History August 6TH 1940 W.H. Doherty of Bell Telephone Laboratories was granted U.S. Patent 2,210,028 on a high efficiency amplifier for radio transmission which speedily came into wide use

On This Day in Telephone History August 6TH 1940

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On This Day in Telephone History August 6TH 1940 W.H. Doherty of Bell Telephone Laboratories was granted U.S. Patent 2,210,028 on a high efficiency amplifier for radio transmission which speedily came into wide use.

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