2269781

Information

• Patent Grant
• 2269781

• References
• Source

• Patent Number

  2,269,781

• Date Filed

  Not available

• Date Issued

  Tuesday, January 13, 1942
  83 years ago

• CPC

  • E21C27/16 - with means for both slitting and breaking-down

• US Classifications

  • 299 - Mining or in situ disintegration of hard material