3578809

Information

• Patent Grant
• 3578809

• References
• Source

• Patent Number

  3,578,809

• Date Filed

  Not available

• Date Issued

  Tuesday, May 18, 1971
  53 years ago

• CPC

  • E21D9/0875 - with a movable support arm carrying cutting tools for attacking the front face

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 405 - Hydraulic and earth engineering