2501574

Information

• Patent Grant
• 2501574

• References
• Source

• Patent Number

  2,501,574

• Date Filed

  Not available

• Date Issued

  Tuesday, March 21, 1950
  74 years ago

• CPC

  • H04L21/04 - at the receiving end

• US Classifications

  • 178 - Telegraphy
  • 250 - Radiant energy