1770214

Information

• Patent Grant
• 1770214

• References
• Source

• Patent Number

  1,770,214

• Date Filed

  Not available

• Date Issued

  Tuesday, July 8, 1930
  94 years ago

• CPC

  • E21B31/107 - using impact means for releasing stuck parts
  • E21B4/08 - impact being obtained by gravity only

• US Classifications

  • 175 - Boring or penetrating the earth