2385251

Information

• Patent Grant
• 2385251

• References
• Source

• Patent Number

  2,385,251

• Date Filed

  Not available

• Date Issued

  Tuesday, September 18, 1945
  79 years ago

• CPC

  • E21D11/403 - combined with the head machine
  • E21D9/0879 - the shield being provided with devices for lining the tunnel
  • E21D11/06 - with bricks
  • E21D11/08 - with preformed concrete slabs
  • E21D11/18 - Arch members; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches

• US Classifications

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