2140684

Information

• Patent Grant
• 2140684

• References
• Source

• Patent Number

  2,140,684

• Date Filed

  Not available

• Date Issued

  Tuesday, December 20, 1938
  86 years ago

• CPC

  • H04L15/18 - Automatic transmitters

• US Classifications

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