On This Day in Telephone History, February 11TH 1915, transcontinental telephone service opened between San Francisco and Philadelphia. During opening ceremonies, the Liberty Bell in Philadelphia was tapped several times and the sound was heard in San Francisco.

On This Day in Telephone History February 11TH 1915

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On This Day in Telephone History, February 11TH 1915, Transcontinental Telephone Service opened between San Francisco and Philadelphia. During opening ceremonies, the Liberty Bell in Philadelphia was tapped several times and the sound was heard in San Francisco.