2308517

Information

• Patent Grant
• 2308517

• References
• Source

• Patent Number

  2,308,517

• Date Filed

  Not available

• Date Issued

  Tuesday, January 19, 1943
  81 years ago

• CPC

  • E21C27/122 - with breaking-down members having a striking action

• US Classifications

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