3800546

Information

• Patent Grant
• 3800546

• References
• Source

• Patent Number

  3,800,546

• Date Filed

  Not available

• Date Issued

  Tuesday, April 2, 1974
  50 years ago

• CPC

  • E21D23/0454 - Trailing plates; Coal face or goaf side sprags
  • E21D23/04 - Structural features of the supporting construction

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 248 - Supports