3373572

Information

• Patent Grant
• 3373572

• References
• Source

• Patent Number

  3,373,572

• Date Filed

  Not available

• Date Issued

  Tuesday, March 19, 1968
  56 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
  • 091 - Motors: expansible chamber type
  • 092 - Expansible chamber devices
  • 299 - Mining or in situ disintegration of hard material