2135581

Information

• Patent Grant
• 2135581

• References
• Source

• Patent Number

  2,135,581

• Date Filed

  Not available

• Date Issued

  Tuesday, November 8, 1938
  86 years ago

• CPC

  • H04L25/44 - using relay distributors

• US Classifications

  • 370 - Multiplex communications
  • 178 - Telegraphy