3921508

Information

• Patent Grant
• 3921508

• References
• Source

• Patent Number

  3,921,508

• Date Filed

  Not available

• Date Issued

  Tuesday, November 25, 1975
  49 years ago

• CPC

  • F24F7/06 - with forced air circulation
  • A01F25/08 - Ventilating means

• US Classifications

  • 454 - Ventilation
  • 237 - Heating systems