2890858

Information

• Patent Grant
• 2890858

• References
• Source

• Patent Number

  2,890,858

• Date Filed

  Not available

• Date Issued

  Tuesday, June 16, 1959
  65 years ago

• CPC

  • E21B11/06 - with driven cutting chains or similarly driven tools

• US Classifications

  • 175 - Boring or penetrating the earth
  • 166 - Wells
  • 173 - Tool driving or impacting