2399074

Information

• Patent Grant
• 2399074

• References
• Source

• Patent Number

  2,399,074

• Date Filed

  Not available

• Date Issued

  Tuesday, April 23, 1946
  78 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