2714505

Information

• Patent Grant
• 2714505

• References
• Source

• Patent Number

  2,714,505

• Date Filed

  Not available

• Date Issued

  Tuesday, August 2, 1955
  69 years ago

• CPC

  • E21D23/0454 - Trailing plates; Coal face or goaf side sprags
  • E21D23/088 - by means of wheels, rollers, caterpillars, belts or worm screws

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 091 - Motors: expansible chamber type
  • 299 - Mining or in situ disintegration of hard material