2230808

Information

• Patent Grant
• 2230808

• References
• Source

• Patent Number

  2,230,808

• Date Filed

  Not available

• Date Issued

  Tuesday, February 4, 1941
  83 years ago

• CPC

  • E21B25/14 - mounted on pivot transverse to core axis

• US Classifications

  • 175 - Boring or penetrating the earth
  • 294 - Handling: hand and hoist-line implements