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Telephone is a kind of remote communication equipment that can send and receive sound. It is generally believed that the telephone was invented by American Alexander Graham Bell in 1876. The improvements and inventions of telephone in history include: toner microphone, manual switchboard, program-controlled telephone exchange, dual-tone multi-frequency dialing, voice digital sampling and so on. In recent years, new technologies include ISDN, DSL, analog mobile phone and digital mobile phone.