3873157

Information

• Patent Grant
• 3873157

• References
• Source

• Patent Number

  3,873,157

• Date Filed

  Not available

• Date Issued

  Tuesday, March 25, 1975
  49 years ago

• CPC

  • E21C25/68 - Machines for making slits combined with equipment for removing
  • E21D9/1026 - the tool-carrier being rotated about a transverse axis
  • E21D9/12 - Devices for removing or hauling away excavated material or spoil Working or loading platforms

• US Classifications

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