2820124

Information

• Patent Grant
• 2820124

• References
• Source

• Patent Number

  2,820,124

• Date Filed

  Not available

• Date Issued

  Tuesday, January 14, 1958
  66 years ago

• CPC

  • H04L15/06 - with a restricted number of keys

• US Classifications

  • 200 - Electricity: circuit makers and breakers
  • 178 - Telegraphy