3238311

Information

• Patent Grant
• 3238311

• References
• Source

• Patent Number

  3,238,311

• Date Filed

  Not available

• Date Issued

  Tuesday, March 1, 1966
  59 years ago

• CPC

  • H04Q1/26 - for signalling trouble in unoccupied sub-exchanges

• US Classifications

  • 370 - Multiplex communications