3638136

Information

• Patent Grant
• 3638136

• References
• Source

• Patent Number

  3,638,136

• Date Filed

  Not available

• Date Issued

  Tuesday, January 25, 1972
  52 years ago

• CPC

  • H03B5/10 - active element in amplifier being vacuum tube

• US Classifications

  • 331 - Oscillators
  • 219 - Electric heating