3085794

Information

• Patent Grant
• 3085794

• References
• Source

• Patent Number

  3,085,794

• Date Filed

  Not available

• Date Issued

  Tuesday, April 16, 1963
  61 years ago

• CPC

  • E21D3/00 - Raising shafts

• US Classifications

  • 182 - Fire escape, ladder, or scaffold
  • 175 - Boring or penetrating the earth
  • 299 - Mining or in situ disintegration of hard material
  • 405 - Hydraulic and earth engineering