3834170

Information

• Patent Grant
• 3834170

• References
• Source

• Patent Number

  3,834,170

• Date Filed

  Not available

• Date Issued

  Tuesday, September 10, 1974
  50 years ago

• CPC

  • E21D9/0607 - the shield being provided with devices for lining the tunnel
  • E21D11/10 - with concrete cast in situ Shuttering also lost shutterings

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 052 - Static structures