3711160

Information

• Patent Grant
• 3711160

• References
• Source

• Patent Number

  3,711,160

• Date Filed

  Not available

• Date Issued

  Tuesday, January 16, 1973
  51 years ago

• CPC

  • E21C25/14 - with equipment for cleaning the slit
  • E21C27/02 - solely by slitting
  • E21C27/24 - by milling means acting on the full working face

• US Classifications

  • 299 - Mining or in situ disintegration of hard material