2859285

Information

• Patent Grant
• 2859285

• References
• Source

• Patent Number

  2,859,285

• Date Filed

  Not available

• Date Issued

  Tuesday, November 4, 1958
  66 years ago

• CPC

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

• US Classifications

  • 379 - Telephonic communications
  • 178 - Telegraphy
  • 340 - Communications: electrical