3854293

Information

• Patent Grant
• 3854293

• References
• Source

• Patent Number

  3,854,293

• Date Filed

  Not available

• Date Issued

  Tuesday, December 17, 1974
  50 years ago

• CPC

  • E21D23/0427 - Shield operating devices; Hinges therefor
  • E21D19/02 - for use in longwall working

• US Classifications

  • 405 - Hydraulic and earth engineering