3677602

Information

• Patent Grant
• 3677602

• References
• Source

• Patent Number

  3,677,602

• Date Filed

  Not available

• Date Issued

  Tuesday, July 18, 1972
  52 years ago

• CPC

  • E21D11/10 - with concrete cast in situ Shuttering also lost shutterings
  • E21D9/04 - Driving tunnels or galleries through loose materials Apparatus therefor not otherwise provided for
  • E21D9/0873 - the shield being provided with devices for lining the tunnel

• US Classifications

  • 299 - Mining or in situ disintegration of hard material