3566981

Information

• Patent Grant
• 3566981

• References
• Source

• Patent Number

  3,566,981

• Date Filed

  Not available

• Date Issued

  Tuesday, March 2, 1971
  53 years ago

• CPC

  • E21B11/02 - Boring rams
  • E21B31/113 - hydraulically-operated

• US Classifications

  • 175 - Boring or penetrating the earth