2139236

Information

• Patent Grant
• 2139236

• References
• Source

• Patent Number

  2,139,236

• Date Filed

  Not available

• Date Issued

  Tuesday, December 6, 1938
  86 years ago

• CPC

  • H04B3/11 - using pilot wire

• US Classifications

  • 333 - Wave transmission lines and networks
  • 330 - Amplifiers