3364682

Information

• Patent Grant
• 3364682

• References
• Source

• Patent Number

  3,364,682

• Date Filed

  Not available

• Date Issued

  Tuesday, January 23, 1968
  57 years ago

• CPC

  • E21D17/04 - for use in longwall working
  • E21D17/02 - Cantilever extension or similar protecting devices
  • 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