3851921

Information

• Patent Grant
• 3851921

• References
• Source

• Patent Number

  3,851,921

• Date Filed

  Not available

• Date Issued

  Tuesday, December 3, 1974
  50 years ago

• CPC

  • E01C23/085 - using power-driven tools

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 172 - Earth working
  • 404 - Road structure, process, or apparatus