3721928

Information

• Patent Grant
• 3721928

• References
• Source

• Patent Number

  3,721,928

• Date Filed

  Not available

• Date Issued

  Tuesday, March 20, 1973
  51 years ago

• CPC

  • G01R19/16509 - using electromagnetic relays
  • H01H71/2445 - using a reed switch

• US Classifications

  • 335 - Electricity: magnetically operated switches, magnets, and electromagnets