3830338

Information

• Patent Grant
• 3830338

• References
• Source

• Patent Number

  3,830,338

• Date Filed

  Not available

• Date Issued

  Tuesday, August 20, 1974
  50 years ago

• CPC

  • E21D9/02 - Driving inclined tunnels or galleries
  • E21F13/04 - Transport of mined material in gravity inclines in staple or inclined shafts

• US Classifications

  • 182 - Fire escape, ladder, or scaffold
  • 104 - Railways
  • 105 - Railway rolling stock
  • 187 - Elevator, industrial lift truck, or stationary lift for vehicle
  • 299 - Mining or in situ disintegration of hard material
  • 405 - Hydraulic and earth engineering