3779023

Information

• Patent Grant
• 3779023

• References
• Source

• Patent Number

  3,779,023

• Date Filed

  Not available

• Date Issued

  Tuesday, December 18, 1973
  51 years ago

• CPC

  • E21D23/0039 - and supported by a strut or by a row of struts parallel to the working face
  • E21D23/0427 - Shield operating devices; Hinges therefor
  • E21D23/0481 - Supports specially adapted for use in combination with the placing of filling-up materials

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 248 - Supports