2770670

Information

• Patent Grant
• 2770670

• References
• Source

• Patent Number

  2,770,670

• Date Filed

  Not available

• Date Issued

  Tuesday, November 13, 1956
  68 years ago

• CPC

  • H04L12/00 - Data switching networks
  • H04L12/04 - Switchboards

• US Classifications

  • 178 - Telegraphy
  • 375 - Pulse or digital communications