3761622

Information

• Patent Grant
• 3761622

• References
• Source

• Patent Number

  3,761,622

• Date Filed

  Not available

• Date Issued

  Tuesday, September 25, 1973
  51 years ago

• CPC

  • H02H1/0084 - by means of pilot wires or a telephone network; watching of these wires
  • H04M11/002 - with telemetering systems

• US Classifications

  • 375 - Pulse or digital communications
  • 379 - Telephonic communications