472256

Information

• Patent Grant
• 472256

• References
• Source

• Patent Number

  472,256

• Date Filed

  Not available

• Date Issued

  Tuesday, April 5, 1892
  132 years ago

• CPC

  • F04D27/004 - by varying driving speed
  • F23N1/062 - using electronic means

• US Classifications

  • 236 - Automatic temperature and humidity regulation