2138896

Information

• Patent Grant
• 2138896

• References
• Source

• Patent Number

  2,138,896

• Date Filed

  Not available

• Date Issued

  Tuesday, December 6, 1938
  86 years ago

• CPC

  • H03B7/04 - active element being vacuum tube

• US Classifications

  • 331 - Oscillators
  • 313 - Electric lamp and discharge devices
  • 333 - Wave transmission lines and networks