3216202

Information

• Patent Grant
• 3216202

• References
• Source

• Patent Number

  3,216,202

• Date Filed

  Not available

• Date Issued

  Tuesday, November 9, 1965
  59 years ago

• CPC

  • E21D23/063 - Retractable cantilever extensions therefor
  • E21D17/08 - Cap joints for obtaining a coal-face free of pit-props

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 248 - Supports