3871707

Information

• Patent Grant
• 3871707

• References
• Source

• Patent Number

  3,871,707

• Date Filed

  Not available

• Date Issued

  Tuesday, March 18, 1975
  50 years ago

• CPC

  • E21D19/04 - for use in drifting galleries
  • E21C27/00 - Machines which completely free the mineral from the seam
  • E21C41/00 - Methods of underground or surface mining Lay-outs therefor
  • E21D20/003 - Machines for drilling anchor holes and setting anchor bolts

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 173 - Tool driving or impacting