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Văn bản từ marsel86 - English

  • Thomas Alva Edison

  • Famous american inventor and employed.
  • Edison got in the U.S. thousand patents and about three thousand patents in the other countries.
  • He improved telegraph, telephone, cinematographic equipment.
  • He constructed electric lamp.
  • It was who suggested the use of a telephone conversation at the beggining of the word " Hello"

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