2872157

Information

• Patent Grant
• 2872157

• References
• Source

• Patent Number

  2,872,157

• Date Filed

  Not available

• Date Issued

  Tuesday, February 3, 1959
  66 years ago

• CPC

  • E21B11/06 - with driven cutting chains or similarly driven tools
  • E02F3/10 - with tools that only loosen the material
  • E21B7/003 - Drilling with mechanical conveying means

• US Classifications

  • 175 - Boring or penetrating the earth
  • 037 - Excavating
  • 173 - Tool driving or impacting
  • 198 - Conveyors: power-driven