3811290

Information

• Patent Grant
• 3811290

• References
• Source

• Patent Number

  3,811,290

• Date Filed

  Not available

• Date Issued

  Tuesday, May 21, 1974
  50 years ago

• CPC

  • E21F13/025 - Shuttle cars
  • E21D20/003 - Machines for drilling anchor holes and setting anchor bolts
  • E21D23/0095 - Temporary supports at the driving front

• US Classifications

  • 405 - Hydraulic and earth engineering