3082299

Information

• Patent Grant
• 3082299

• References
• Source

• Patent Number

  3,082,299

• Date Filed

  Not available

• Date Issued

  Tuesday, March 19, 1963
  61 years ago

• CPC

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

• US Classifications

  • 379 - Telephonic communications