2167220

Information

• Patent Grant
• 2167220

• References
• Source

• Patent Number

  2,167,220

• Date Filed

  Not available

• Date Issued

  Tuesday, July 25, 1939
  85 years ago

• CPC

  • E21B21/015 - Means engaging the bore entrance
  • Y10S29/079 - Removable debris receptacle

• US Classifications

  • 175 - Boring or penetrating the earth
  • 029 - Metal working