3430717

Information

• Patent Grant
• 3430717

• References
• Source

• Patent Number

  3,430,717

• Date Filed

  Not available

• Date Issued

  Tuesday, March 4, 1969
  55 years ago

• CPC

  • E21B10/32 - with expansible cutting tools
  • E21B7/28 - Enlarging drilled holes
  • E21B11/02 - Boring rams

• US Classifications

  • 175 - Boring or penetrating the earth
  • 299 - Mining or in situ disintegration of hard material