2173722

Information

• Patent Grant
• 2173722

• References
• Source

• Patent Number

  2,173,722

• Date Filed

  Not available

• Date Issued

  Tuesday, September 19, 1939
  84 years ago

• CPC

  • H04L5/1407 - Artificial lines or their setting

• US Classifications

  • 178 - Telegraphy
  • 370 - Multiplex communications