2225653

Information

• Patent Grant
• 2225653

• References
• Source

• Patent Number

  2,225,653

• Date Filed

  Not available

• Date Issued

  Tuesday, December 24, 1940
  84 years ago

• CPC

  • H04B3/11 - using pilot wire

• US Classifications

  • 323 - Electricity: power supply or regulation systems
  • 324 - Electricity: measuring and testing