3809870

Information

• Patent Grant
• 3809870

• References
• Source

• Patent Number

  3,809,870

• Date Filed

  Not available

• Date Issued

  Tuesday, May 7, 1974
  50 years ago

• CPC

  • E21C35/00 - Miscellaneous items relating to machines for slitting or completely freeing the mineral from the seam
  • B23F23/12 - Other devices
  • B23Q17/0947 - Monitoring devices for measuring cutting angles
  • G01N3/58 - Investigating machinability by cutting tools Investigating the cutting ability of tools
  • G05B2219/37525 - Mean, average values, statistical derived values

• US Classifications

  • 702 - Data processing: measuring, calibrating, or testing
  • 073 - Measuring and testing