3250078

Information

• Patent Grant
• 3250078

• References
• Source

• Patent Number

  3,250,078

• Date Filed

  Not available

• Date Issued

  Tuesday, May 10, 1966
  58 years ago

• CPC

  • E21D9/06 - Making by using a driving shield
  • E21D9/065 - with devices for provisionally supporting the front face
  • E21D19/04 - for use in drifting galleries

• US Classifications

  • 405 - Hydraulic and earth engineering