2218989

Information

• Patent Grant
• 2218989

• References
• Source

• Patent Number

  2,218,989

• Date Filed

  Not available

• Date Issued

  Tuesday, October 22, 1940
  84 years ago

• CPC

  • H03D1/16 - of discharge tubes

• US Classifications

  • 329 - Demodulators
  • 313 - Electric lamp and discharge devices