3192722

Information

• Patent Grant
• 3192722

• References
• Source

• Patent Number

  3,192,722

• Date Filed

  Not available

• Date Issued

  Tuesday, July 6, 1965
  59 years ago

• CPC

  • E21D23/06 - Special mine caps or special tops of pit-props for permitting step-by-step movement
  • E21D23/0047 - without essential shifting devices
  • E21D23/0052 - with advancing shifting devices connected therewith
  • E21D23/0073 - with advancing shifting devices connected therewith
  • E21F13/086 - Armoured conveyors shifting devices

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 091 - Motors: expansible chamber type