3928981

Information

• Patent Grant
• 3928981

• References
• Source

• Patent Number

  3,928,981

• Date Filed

  Not available

• Date Issued

  Tuesday, December 30, 1975
  48 years ago

• CPC

  • E21D23/0427 - Shield operating devices; Hinges therefor
  • E21D23/0043 - and supported by two or more rows of struts parallel to the working face

• US Classifications

  • 405 - Hydraulic and earth engineering