1391522

Information

• Patent Grant
• 1391522

• References
• Source

• Patent Number

  1,391,522

• Date Filed

  Not available

• Date Issued

  Tuesday, September 20, 1921
  103 years ago

• CPC

  • H02P1/18 - for starting an individual dc motor
  • H01H15/08 - Contact arrangements for providing make-before-break operation

• US Classifications

  • 338 - Electrical resistors
  • 218 - High-voltage switches with arc preventing or extinguishing devices