3472555

Information

• Patent Grant
• 3472555

• References
• Source

• Patent Number

  3,472,555

• Date Filed

  Not available

• Date Issued

  Tuesday, October 14, 1969
  55 years ago

• CPC

  • E01C23/0885 - with vertical or steeply inclined rotary axis
  • E21D9/01 - Methods or apparatus for enlarging or restoring the cross-section of tunnels

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 198 - Conveyors: power-driven