2629020

Information

• Patent Grant
• 2629020

• References
• Source

• Patent Number

  2,629,020

• Date Filed

  Not available

• Date Issued

  Tuesday, February 17, 1953
  71 years ago

• CPC

  • H04M7/08 - for phantom working

• US Classifications

  • 370 - Multiplex communications
  • 315 - Electric lamp and discharge devices: systems
  • 380 - Cryptography