1870725

Information

• Patent Grant
• 1870725

• References
• Source

• Patent Number

  1,870,725

• Date Filed

  Not available

• Date Issued

  Tuesday, August 9, 1932
  92 years ago

• CPC

  • E21B7/122 - with submersible vertically movable guide

• US Classifications

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