2670943

Information

• Patent Grant
• 2670943

• References
• Source

• Patent Number

  2,670,943

• Date Filed

  Not available

• Date Issued

  Tuesday, March 2, 1954
  71 years ago

• CPC

  • E21C27/46 - by percussed planing means

• US Classifications

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