AMERICAN

PULLEYS AND SHEAVES USED IN POWER TRANSMISSION INSTALLATIONS INVOLVING DRIVE BELTS BUT EXPLICITY EXCLUDING SHEAVES WHICH ARE EMPLOYED IN CONNECTION WITH ROPE OF ANY KIND AND WHICH RELATE TO CONSTRUCTION MACHINERY AND SIMILAR EQUIPMENT SOMETIMES AS IDLERS AND SOMTIMES AS PART OF EQUIPMENT TO DRIVE OR PULL ON ROPE, IN THAT FIELD OF COMMERCIAL ACTIVITY, COMMONLY KNOWN AS THE CRANE, HOIST AND DERRICK FIELD, COMPRISING THE MANUFACTURE, SALE AND DISTRIBUTION OF CRANES, WINCHES, DERRICKS, HOISTING EQUIPMENT, TACKLE BLOCKS AND MATERIAL HANDLING EQUIPMENT ADAPTED FOR USE IN CONSTRUCTION PROJECTS INDUSTRIAL PLANT OPERATION, AND LOADING CARGO TO AND FROM COMMON CARRIERS