B

electrical apparatus, machines, and supplies used in the construction and operation of electrically operated transit systems - namely, trolley wire hangers, section insulators, strain clamps and strain insulators for electric conductors, insulated bolts, trolley wire ears and clamps, cable and trolley wire splicers, trolley frogs and crossovers, expansion supports for trolley wire hangers, electric rail bonds, moldable plastics for electric insulators, feeder line switches, hangers for catenary systems, approach tips for trolley frogs, electric ARC welding machines, trolley wire taps, connector and dead ending devices for messenger cables, lubricators for mounting on trolley poles to apply fluid lubricants to trolley wires, curve segments and spacers for trolley wire systems, electric car couplers for trolley pole catchers and retrievers, trolley pole bases, and for trolley harps, wheels, shoes and inserts for shoes