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The telephone is a communication device invented by Alexander Graham Bell in 1876. It allows for the transmission of voice and sound over long distances.
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Alexander Graham Bell: He was an inventor, scientist, and engineer who is credited with patenting the first practical telephone.
Telegraph: This was a long-distance communication device that transmitted coded messages via electrical signals before the invention of telephones.
Communication Technology: This refers to all tools and techniques used for transmitting or sharing information.