2178894

Information

• Patent Grant
• 2178894

• References
• Source

• Patent Number

  2,178,894

• Date Filed

  Not available

• Date Issued

  Tuesday, November 7, 1939
  85 years ago

• CPC

  • B60H1/3428 - using a set of pivoting shutters and a pivoting frame
  • B60H2001/3485 - Air temperature regulation

• US Classifications

  • 454 - Ventilation
  • 165 - Heat exchange