3856356

Information

• Patent Grant
• 3856356

• References
• Source

• Patent Number

  3,856,356

• Date Filed

  Not available

• Date Issued

  Tuesday, December 24, 1974
  49 years ago

• CPC

  • E21D23/00 - Mine roof supports for step- by- step movement
  • E21D23/0052 - with advancing shifting devices connected therewith

• US Classifications

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