1388831

Information

• Patent Grant
• 1388831

• References
• Source

• Patent Number

  1,388,831

• Date Filed

  Not available

• Date Issued

  Tuesday, August 23, 1921
  103 years ago

• CPC

  • B63B23/10 - with positive drive of the arms
  • B66C23/72 - Counterweights or supports for balancing lifting couples
  • B66C2700/0392 - Movement of the crane arm Coupling of the crane arm with the counterweights Safety devices for the movement of the arm

• US Classifications

  • 212 - Traversing hoists
  • 114 - Ships