3830456

Information

• Patent Grant
• 3830456

• References
• Source

• Patent Number

  3,830,456

• Date Filed

  Not available

• Date Issued

  Tuesday, August 20, 1974
  50 years ago

• CPC

  • E21D20/003 - Machines for drilling anchor holes and setting anchor bolts
  • E21D19/02 - for use in longwall working

• US Classifications

  • 254 - Implements or apparatus for applying pushing or pulling force
  • 405 - Hydraulic and earth engineering