2997661

Information

• Patent Grant
• 2997661

• References
• Source

• Patent Number

  2,997,661

• Date Filed

  Not available

• Date Issued

  Tuesday, August 22, 1961
  64 years ago

• CPC

  • G05D23/2237 - using discharge tubes

• US Classifications

  • 331 - Oscillators
  • 236 - Automatic temperature and humidity regulation