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You asked:

what did alexander graham bell invent

  • Alexander Graham Bell is an inventor of telephone, AT&T, metal detector, phone number and modern telephone.
  • metal detector
    metal detector
    metal detector

    metal detector (a tool that uses electromagnetic induction to detect metal)

  • telephone

    telephone (electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds)

  • AT&T

    AT&T, the telecommunications company, with subsidiaries including AT&T Mobility

  • phone number

    telephone number

  • modern telephone

    telephone (electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds) that is modern (belonging to the recent era, not ancient)