3754402

Information

• Patent Grant
• 3754402

• References
• Source

• Patent Number

  3,754,402

• Date Filed

  Not available

• Date Issued

  Tuesday, August 28, 1973
  51 years ago

• CPC

  • E21D23/06 - Special mine caps or special tops of pit-props for permitting step-by-step movement
  • E21D17/02 - Cantilever extension or similar protecting devices
  • E21D23/0013 - Frame type supports

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 248 - Supports