1621640

Information

• Patent Grant
• 1621640

• References
• Source

• Patent Number

  1,621,640

• Date Filed

  Not available

• Date Issued

  Tuesday, March 22, 1927
  97 years ago

• CPC

  • F24D9/02 - Hot water and steam systems

• US Classifications

  • 236 - Automatic temperature and humidity regulation
  • 237 - Heating systems