3672174

Information

• Patent Grant
• 3672174

• References
• Source

• Patent Number

  3,672,174

• Date Filed

  Not available

• Date Issued

  Tuesday, June 27, 1972
  52 years ago

• CPC

  • E21D23/22 - incorporated in mine caps
  • E21D23/0017 - Pile type supports

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 091 - Motors: expansible chamber type
  • 299 - Mining or in situ disintegration of hard material