2767969

Information

• Patent Grant
• 2767969

• References
• Source

• Patent Number

  2,767,969

• Date Filed

  Not available

• Date Issued

  Tuesday, October 23, 1956
  68 years ago

• CPC

  • E21C27/18 - by both slitting and planing

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 173 - Tool driving or impacting