2276731

Information

• Patent Grant
• 2276731

• References
• Source

• Patent Number

  2,276,731

• Date Filed

  Not available

• Date Issued

  Tuesday, March 17, 1942
  82 years ago

• CPC

  • E21C27/04 - by a single chain guided on a frame with or without auxiliary slitting means

• US Classifications

  • 299 - Mining or in situ disintegration of hard material