A 29-year-old Alexander Graham Bell was granted U.S.
Patent No. 174,465 for the telephone on March 7, 1876.
The patent, often called the most valuable in U.S. history,
was filed on February 14, 1876—just hours before a similar
caveat by Elisha Gray—securing Bell the rights to the
invention.
Three days later, on March 10, 1876, Bell made the first
successful telephone call to his assistant…Thomas
Watson.
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