3729137

Information

• Patent Grant
• 3729137

• References
• Source

• Patent Number

  3,729,137

• Date Filed

  Not available

• Date Issued

  Tuesday, April 24, 1973
  51 years ago

• CPC

  • E02F3/9206 - Digging devices using blowing effect only, like jets or propellers
  • E02F5/305 - Arrangements for breaking-up hard ground
  • E02F5/323 - Percussion-type rippers
  • E21C25/60 - Slitting by jets of water or other liquid

• US Classifications

  • 239 - Fluid sprinkling, spraying, and diffusing
  • 299 - Mining or in situ disintegration of hard material