1290591

Information

• Patent Grant
• 1290591

• References
• Source

• Patent Number

  1,290,591

• Date Filed

  Not available

• Date Issued

  Tuesday, January 7, 1919
  106 years ago

• CPC

  • E21C27/10 - by both slitting and breaking-down

• US Classifications

  • 299 - Mining or in situ disintegration of hard material