3447328

Information

• Patent Grant
• 3447328

• References
• Source

• Patent Number

  3,447,328

• Date Filed

  Not available

• Date Issued

  Tuesday, June 3, 1969
  55 years ago

• CPC

  • E21D11/367 - for junction with the longwall coal face
  • E21F13/10 - Anchorings for conveyors

• US Classifications

  • 405 - Hydraulic and earth engineering