2668039

Information

• Patent Grant
• 2668039

• References
• Source

• Patent Number

  2,668,039

• Date Filed

  Not available

• Date Issued

  Tuesday, February 2, 1954
  70 years ago

• CPC

  • E21C27/126 - with slitting and breaking-down members situated in parallel on an intermediary level

• US Classifications

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