2419329

Information

• Patent Grant
• 2419329

• References
• Source

• Patent Number

  2,419,329

• Date Filed

  Not available

• Date Issued

  Tuesday, April 22, 1947
  77 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