3266845

Information

• Patent Grant
• 3266845

• References
• Source

• Patent Number

  3,266,845

• Date Filed

  Not available

• Date Issued

  Tuesday, August 16, 1966
  58 years ago

• CPC

  • E21D9/1053 - for making a slit along the perimeter of the tunnel profile, the remaining core being removed subsequently
  • E21D19/04 - for use in drifting galleries

• US Classifications

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