Rutherford B. Hayes is calling

http://www.history.com/this-day-in-history/hayes-has-first-phone-installed-in-white-house

May 10, 1877:
Hayes has first phone installed in White House

On this day in 1877, President Rutherford B. Hayes has the White House's first telephone installed in the mansion's telegraph room. President Hayes embraced the new technology, though he rarely received phone calls. In fact, the Treasury Department possessed the only other direct phone line to the White House at that time. 

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