3115754

Information

• Patent Grant
• 3115754

• References
• Source

• Patent Number

  3,115,754

• Date Filed

  Not available

• Date Issued

  Tuesday, December 31, 1963
  61 years ago

• CPC

  • E21D23/0095 - Temporary supports at the driving front
  • E21D19/04 - for use in drifting galleries
  • E21D23/082 - acting solely on the elements of the supports

• US Classifications

  • 405 - Hydraulic and earth engineering
  • 091 - Motors: expansible chamber type
  • 092 - Expansible chamber devices
  • 182 - Fire escape, ladder, or scaffold