3731976

Information

• Patent Grant
• 3731976

• References
• Source

• Patent Number

  3,731,976

• Date Filed

  Not available

• Date Issued

  Tuesday, May 8, 1973
  51 years ago

• CPC

  • E21F13/065 - Scrapers
  • E21C35/20 - General features of equipment for removal of chippings

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 173 - Tool driving or impacting