ASSEMBLIES FOR ELECTRIC POWER TRANSMISSION-NAMELY, TROLLEY BUSWAYS AND TROLLEYS, BUS BARS WITH INSULATION AND HOUSING THEREFOR, AND PARTS OF SAID ASSEMBLIES; AND ACCESSORIES FOR SAID ASSEMBLIES-NAMELY, COUPLING PLATES, END CAPS, END FEED SETS, CURRENT CONNECTION BOXES, HANGER STRAPS AND SUPPORTS, FUSE BLOCKS