2143349

Information

• Patent Grant
• 2143349

• References
• Source

• Patent Number

  2,143,349

• Date Filed

  Not available

• Date Issued

  Tuesday, January 10, 1939
  86 years ago

• CPC

  • E21B4/08 - impact being obtained by gravity only

• US Classifications

  • 175 - Boring or penetrating the earth