2175622

Information

• Patent Grant
• 2175622

• References
• Source

• Patent Number

  2,175,622

• Date Filed

  Not available

• Date Issued

  Tuesday, October 10, 1939
  85 years ago

• CPC

  • E21B29/007 - with a radially-retracting cutter rotating outside the pipe

• US Classifications

  • 166 - Wells