3487649

Information

• Patent Grant
• 3487649

• References
• Source

• Patent Number

  3,487,649

• Date Filed

  Not available

• Date Issued

  Tuesday, January 6, 1970
  55 years ago

• CPC

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

• US Classifications

  • 405 - Hydraulic and earth engineering