2979318

Information

• Patent Grant
• 2979318

• References
• Source

• Patent Number

  2,979,318

• Date Filed

  Not available

• Date Issued

  Tuesday, April 11, 1961
  64 years ago

• CPC

  • E21D9/1053 - for making a slit along the perimeter of the tunnel profile, the remaining core being removed subsequently

• US Classifications

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