1831744

Information

• Patent Grant
• 1831744

• References
• Source

• Patent Number

  1,831,744

• Date Filed

  Not available

• Date Issued

  Tuesday, November 10, 1931
  93 years ago

• CPC

  • H04B1/60 - Supervising unattended repeaters

• US Classifications

  • 330 - Amplifiers
  • 324 - Electricity: measuring and testing