1218509

Information

• Patent Grant
• 1218509

• References
• Source

• Patent Number

  1,218,509

• Date Filed

  Not available

• Date Issued

  Tuesday, March 6, 1917
  108 years ago

• CPC

  • H05B31/0093 - with a threaded rod

• US Classifications

  • 314 - Electric lamp and discharge devices: consumable electrodes