2859682

Information

• Patent Grant
• 2859682

• References
• Source

• Patent Number

  2,859,682

• Date Filed

  Not available

• Date Issued

  Tuesday, November 11, 1958
  66 years ago

• CPC

  • E21F1/006 - Ventilation at the working face of galleries or tunnels

• US Classifications

  • 454 - Ventilation
  • 299 - Mining or in situ disintegration of hard material