1691997

Information

• Patent Grant
• 1691997

• References
• Source

• Patent Number

  1,691,997

• Date Filed

  Not available

• Date Issued

  Tuesday, November 20, 1928
  96 years ago

• CPC

  • H01T13/12 - Means on sparking plugs for facilitating engagement by tool or by hand

• US Classifications

  • 313 - Electric lamp and discharge devices