420469

Information

• Patent Grant
• 420469

• References
• Source

• Patent Number

  420,469

• Date Filed

  Not available

• Date Issued

  Tuesday, February 4, 1890
  135 years ago

• CPC

  • H02P7/063 - using centrifugal devices
  • Y10S388/928 - Which controls position of commutator brushes

• US Classifications

  • 388 - Electricity: motor control systems
  • 361 - Electricity: electrical systems and devices