3911686

Information

• Patent Grant
• 3911686

• References
• Source

• Patent Number

  3,911,686

• Date Filed

  Not available

• Date Issued

  Tuesday, October 14, 1975
  49 years ago

• CPC

  • E21D23/0039 - and supported by a strut or by a row of struts parallel to the working face
  • E21D23/0409 - Aligning or guiding means for the supports or for the constitutive parts of the supports

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 248 - Supports