Racquet sport accessories, namely strings, grips, grommets, and guards for racquets used in tennis, racquetball, squash and badminton

Electric accumulators; Energy storage and energy conversion apparatus and instruments, namely, pumped-storage hydroelectricity for energy storage and pumped-storage hydroelectricity for storing and converting hydraulic potential energy and elastic potential energy; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling the distribution or use of electricity; energy harvesting and storage devices, namely, hydroelectric energy harvesting and s...