3216168

Information

• Patent Grant
• 3216168

• References
• Source

• Patent Number

  3,216,168

• Date Filed

  Not available

• Date Issued

  Tuesday, November 9, 1965
  59 years ago

• CPC

  • E21D17/006 - characterised by the material
  • E21D17/01 - characterised by the shape of the cap
  • E21D17/08 - Cap joints for obtaining a coal-face free of pit-props
  • Y10T403/32451 - Step-by-step adjustment

• US Classifications

  • 052 - Static structures
  • 403 - Joints and connections
  • 405 - Hydraulic and earth engineering