3823654

Information

• Patent Grant
• 3823654

• References
• Source

• Patent Number

  3,823,654

• Date Filed

  Not available

• Date Issued

  Tuesday, July 16, 1974
  50 years ago

• CPC

  • E21F1/003 - Ventilation of traffic tunnels
  • F24F7/06 - with forced air circulation

• US Classifications

  • 454 - Ventilation