3373551

Information

• Patent Grant
• 3373551

• References
• Source

• Patent Number

  3,373,551

• Date Filed

  Not available

• Date Issued

  Tuesday, March 19, 1968
  56 years ago

• CPC

  • E21D23/081 - forming parts of the roof supports
  • D01H1/183 - Overhead suspension devices
  • D01H15/00 - Piecing arrangements; Automatic end-finding
  • D01H15/013 - Carriages travelling along the machines
  • E21D15/55 - of prop heads or feet
  • E21D23/0069 - without essential advancing shifting devices
  • E21D23/06 - Special mine caps or special tops of pit-props for permitting step-by-step movement

• US Classifications

  • 057 - Textiles: spinning, twisting, and twining