3677355

Information

• Patent Grant
• 3677355

• References
• Source

• Patent Number

  3,677,355

• Date Filed

  Not available

• Date Issued

  Tuesday, July 18, 1972
  52 years ago

• CPC

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

• US Classifications

  • 175 - Boring or penetrating the earth