3218811

Information

• Patent Grant
• 3218811

• References
• Source

• Patent Number

  3,218,811

• Date Filed

  Not available

• Date Issued

  Tuesday, November 23, 1965
  59 years ago

• CPC

  • E21D23/04 - Structural features of the supporting construction
  • E21D17/01 - characterised by the shape of the cap
  • E21D23/06 - Special mine caps or special tops of pit-props for permitting step-by-step movement

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 248 - Supports