Alexander Graham Bell (1847 - 1922) was professor of voice physiology at Boston University. He was interested in telegraphy, and studied multiple-telegraphy that enabled multiple communications simultaneously using one line. He had been interested in transmitting voice electrically for some time and was thinking of how to send voice using electromagnets. He proceeded with his research and applied for a patent on Feb. 14, 1876. It was on March 10, 1876 when he succeeded in conversation using equipment which was further developed from the patent. The first voice was "Mr. Watson, come here, I want you." A Japanese student who was studying under the guidance of Bell at that time, visited him and tried a conversation in Japanese. In the same year, the telephone invented by Bell was displayed in the Philadelphia international exposition and became a major topic of conversation.

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