1830691

Information

• Patent Grant
• 1830691

• References
• Source

• Patent Number

  1,830,691

• Date Filed

  Not available

• Date Issued

  Tuesday, November 3, 1931
  93 years ago

• CPC

  • B60H1/00457 - Ventilation unit
  • Y10S165/096 - Pivotal movement of adjustable cover

• US Classifications

  • 165 - Heat exchange
  • 237 - Heating systems
  • 454 - Ventilation