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Communication system

  • US 5,146,493 A
  • Filed: 06/14/1990
  • Issued: 09/08/1992
  • Est. Priority Date: 07/06/1989
  • Status: Expired due to Term
First Claim
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1. A communication system comprising a card-like device and a data receiving apparatus for receiving data from said card-like device,said data receiving apparatus comprising:

  • communication means for communicating via a line on the basis of data received from said card-like device;

    obtaining means for obtaining electric power from the line;

    a first internal power supply for generating electric power independently of the electric power from the line; and

    first supply means for supplying said card-like device with electric power from a selected one of said obtaining means and said first internal power supply, andsaid card-like device comprising;

    transmission means for transmitting data to said data receiving apparatus without using a conductor;

    a second internal power supply for generating electric power independently of the electric power from said first supply means; and

    second supply means for supplying said transmission means with electric power from a selected one of said first supply means and said second internal power supply.

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