Seventy-five years of the telephone: An evolution in technology

SEVENTY-FIVE years ago — on March 10, 1876 — the inventor spoke and his assistant heard the first sentence to be transmitted by telephone: “MR. WATSON, COME HERE; I WANT YOU.” Three days earlier, U.S. Patent No. 174,465 had been granted to Alexander Graham Bell for his concept of means for making the conversion between the air vibrations of an uttered sound and their corresponding electrical undulations.