2742272

Information

• Patent Grant
• 2742272

• References
• Source

• Patent Number

  2,742,272

• Date Filed

  Not available

• Date Issued

  Tuesday, April 17, 1956
  69 years ago

• CPC

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

• US Classifications

  • 299 - Mining or in situ disintegration of hard material