3489460

Information

• Patent Grant
• 3489460

• References
• Source

• Patent Number

  3,489,460

• Date Filed

  Not available

• Date Issued

  Tuesday, January 13, 1970
  55 years ago

• CPC

  • E21C35/14 - Equipment for pressing the conveyor towards the working face
  • E21D23/14 - Effecting automatic sequential movement of supports

• US Classifications

  • 299 - Mining or in situ disintegration of hard material
  • 251 - Valves and valve actuation
  • 405 - Hydraulic and earth engineering