3475561

Information

• Patent Grant
• 3475561

• References
• Source

• Patent Number

  3,475,561

• Date Filed

  Not available

• Date Issued

  Tuesday, October 28, 1969
  55 years ago

• CPC

  • H04M7/16 - in systems employing carrier frequencies

• US Classifications

  • 370 - Multiplex communications
  • 379 - Telephonic communications
  • 455 - Telecommunications