1840813

Information

• Patent Grant
• 1840813

• References
• Source

• Patent Number

  1,840,813

• Date Filed

  Not available

• Date Issued

  Tuesday, January 12, 1932
  93 years ago

• CPC

  • G05D16/0677 - using one membrane without spring

• US Classifications

  • 236 - Automatic temperature and humidity regulation