3377105

Information

• Patent Grant
• 3377105

• References
• Source

• Patent Number

  3,377,105

• Date Filed

  Not available

• Date Issued

  Tuesday, April 9, 1968
  56 years ago

• CPC

  • E21D9/0873 - the shield being provided with devices for lining the tunnel

• US Classifications

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