2997853

Information

• Patent Grant
• 2997853

• References
• Source

• Patent Number

  2,997,853

• Date Filed

  Not available

• Date Issued

  Tuesday, August 29, 1961
  63 years ago

• CPC

  • E21D9/06 - Making by using a driving shield
  • E21D9/065 - with devices for provisionally supporting the front face

• US Classifications

  • 405 - Hydraulic and earth engineering