2466709

Information

• Patent Grant
• 2466709

• References
• Source

• Patent Number

  2,466,709

• Date Filed

  Not available

• Date Issued

  Tuesday, April 12, 1949
  75 years ago

• CPC

  • E21D9/117 - mounted for orientating or sideways shifting relative to the frame
  • E21D9/087 - with a rotary drilling-head cutting simultaneously the whole cross-section
  • E21D9/093 - Control of the driving shield

• US Classifications

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