2867427

Information

• Patent Grant
• 2867427

• References
• Source

• Patent Number

  2,867,427

• Date Filed

  Not available

• Date Issued

  Tuesday, January 6, 1959
  66 years ago

• CPC

  • E21C27/26 - by closely adjacent cutter chains acting on the full working face

• US Classifications

  • 299 - Mining or in situ disintegration of hard material