3857246

Information

• Patent Grant
• 3857246

• References
• Source

• Patent Number

  3,857,246

• Date Filed

  Not available

• Date Issued

  Tuesday, December 31, 1974
  50 years ago

• CPC

  • E21C35/14 - Equipment for pressing the conveyor towards the working face
  • 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
  • 092 - Expansible chamber devices