2890861

Information

• Patent Grant
• 2890861

• References
• Source

• Patent Number

  2,890,861

• Date Filed

  Not available

• Date Issued

  Tuesday, June 16, 1959
  65 years ago

• CPC

  • E21B7/143 - underwater
  • G01V1/104 - using explosive charges

• US Classifications

  • 175 - Boring or penetrating the earth