2089944

Information

• Patent Grant
• 2089944

• References
• Source

• Patent Number

  2,089,944

• Date Filed

  Not available

• Date Issued

  Tuesday, August 17, 1937
  87 years ago

• CPC

  • E21C27/128 - with breaking-down members functioning on the slitting level

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 173 - Tool driving or impacting
  • 175 - Boring or penetrating the earth