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In page Alexander Graham Bell:
"On March 7, 1876, the U.S. Patent Office issued Bell patent 174,465. It covered "the method of, and apparatus for, transmitting vocal or other sounds telegraphically ... by causing electrical undulations, similar in form to the vibrations of the air accompanying the said vocal or other sound"[3][N 1] Bell returned to Boston that day and the next day resumed work, drawing in his notebook a diagram similar to that in Gray's patent caveat.[citation needed]
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