3578811

Information

• Patent Grant
• 3578811

• References
• Source

• Patent Number

  3,578,811

• Date Filed

  Not available

• Date Issued

  Tuesday, May 18, 1971
  53 years ago

• CPC

  • E21C25/145 - Cowls
  • E21C25/14 - with equipment for cleaning the slit

• US Classifications

  • 299 - Mining or in situ disintegration of hard material