2831668

Information

• Patent Grant
• 2831668

• References
• Source

• Patent Number

  2,831,668

• Date Filed

  Not available

• Date Issued

  Tuesday, April 22, 1958
  66 years ago

• CPC

  • E21C37/02 - by wedges

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 175 - Boring or penetrating the earth
  • 451 - Abrading