1873609

Information

• Patent Grant
• 1873609

• References
• Source

• Patent Number

  1,873,609

• Date Filed

  Not available

• Date Issued

  Tuesday, August 23, 1932
  93 years ago

• CPC

  • H04L25/46 - using tuning forks or vibrating reeds

• US Classifications

  • 388 - Electricity: motor control systems
  • 318 - Electricity: motive power systems