3696873

Information

• Patent Grant
• 3696873

• References
• Source

• Patent Number

  3,696,873

• Date Filed

  Not available

• Date Issued

  Tuesday, October 10, 1972
  52 years ago

• CPC

  • E21B49/02 - by mechanically taking samples of the soil
  • E21B11/02 - Boring rams

• US Classifications

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