what is telephone ?
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A telephone, or phone, is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly. A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables and other communication channels to another telephone which reproduces the sound to the receiving user.
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a system for transmitting voices over a distance using wire or radio, by converting acoustic vibrations to electrical signals.
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