1525781

Information

• Patent Grant
• 1525781

• References
• Source

• Patent Number

  1,525,781

• Date Filed

  Not available

• Date Issued

  Tuesday, February 10, 1925
  99 years ago

• CPC

  • F24F11/0001 - for ventilation
  • Y10T74/118 - Winding knob trip [e.g., alarm mechanism]

• US Classifications

  • 049 - Movable or removable closures
  • 074 - Machine element or mechanism
  • 454 - Ventilation