3539023

Information

• Patent Grant
• 3539023

• References
• Source

• Patent Number

  3,539,023

• Date Filed

  Not available

• Date Issued

  Tuesday, November 10, 1970
  54 years ago

• CPC

  • E21B7/203 - using down-hole drives

• US Classifications

  • 175 - Boring or penetrating the earth