990722

Information

• Patent Grant
• 990722

• References
• Source

• Patent Number

  990,722

• Date Filed

  Not available

• Date Issued

  Tuesday, April 25, 1911
  114 years ago

• CPC

  • H01R43/14 - Maintenance of current collectors
  • Y10T409/306272 - For machining commutator

• US Classifications

  • 409 - Gear cutting, milling, or planing
  • 451 - Abrading