2139077

Information

• Patent Grant
• 2139077

• References
• Source

• Patent Number

  2,139,077

• Date Filed

  Not available

• Date Issued

  Tuesday, December 6, 1938
  86 years ago

• CPC

  • E21B4/08 - impact being obtained by gravity only

• US Classifications

  • 076 - Metal tools and implements, making
  • 175 - Boring or penetrating the earth