2744170

Information

• Patent Grant
• 2744170

• References
• Source

• Patent Number

  2,744,170

• Date Filed

  Not available

• Date Issued

  Tuesday, May 1, 1956
  68 years ago

• CPC

  • H04Q1/26 - for signalling trouble in unoccupied sub-exchanges
  • H04B17/409 - by means of resistance, voltage or current measurement

• US Classifications

  • 370 - Multiplex communications