2183340

Information

• Patent Grant
• 2183340

• References
• Source

• Patent Number

  2,183,340

• Date Filed

  Not available

• Date Issued

  Tuesday, December 12, 1939
  85 years ago

• CPC

  • H03K4/10 - using as active elements vacuum tubes only

• US Classifications

  • 315 - Electric lamp and discharge devices: systems
  • 331 - Oscillators