3392531

Information

• Patent Grant
• 3392531

• References
• Source

• Patent Number

  3,392,531

• Date Filed

  Not available

• Date Issued

  Tuesday, July 16, 1968
  56 years ago

• CPC

  • E21D23/0065 - driven, or automatically
  • E21D23/12 - Control
  • E21D23/142 - Measuring the advance of support units with respect to external points of reference
  • E21D23/144 - Measuring the advance of support units with respect to internal points of reference

• US Classifications

  • 405 - Hydraulic and earth engineering