3675433

Information

• Patent Grant
• 3675433

• References
• Source

• Patent Number

  3,675,433

• Date Filed

  Not available

• Date Issued

  Tuesday, July 11, 1972
  52 years ago

• CPC

  • E21D11/40 - Devices or apparatus specially adapted for handling or placing units of linings or supporting units for tunnels or galleries
  • E21D9/02 - Driving inclined tunnels or galleries

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 299 - Mining or in situ disintegration of hard material