Fuel cells; fuel cell electrodes; electrolyzer electrodes; hydrogen fuel cells; electrolysers; electrolytic cells; water electrolysers (term considered too vague by the International Bureau pursuant to Rule 13 (2) (b) of the Regulations); fuel cell power systems; fuel cell stacks; integrated fuel cell systems; membrane electrode assembly; catalyst coated membranes; membranes for hydrogen fuel cells; membranes for electrolysers; batteries, electric; anode batteries; apparatus and instruments for weighing, measuring, detecting, testing and inspecting fuel cells and hydrogen generators; fuel cell and hydrogen generators test benches (term considered too vague by the International Bureau pursuant to Rule 13 (2) (b) of the Regulations); anodes, sensor, cathodes; anodes, sensor, cathodes, separators for use in fuel cells; hydrogen storage systems (term considered too vague by the International Bureau pursuant to Rule 13 (2) (b) of the Regulations); hydrogen storage systems, namely systems containing an electrolyser for converting electrical power into hydrogen gas (term considered too vague by the International Bureau pursuant to Rule 13 (2) (b) of the Regulations); apparatus for storing hydrogen and for converting hydrogen into electrical power (term considered too vague by the International Bureau pursuant to Rule 13 (2) (b) of the Regulations); apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling the distribution or use of electricity; accumulators, electric; batteries, electric, for vehicles; solar batteries; electric wire harnesses for automobiles; cables, electric; starter cables for motors; battery chargers; portable power chargers; contacts, electric; high tension batteries; battery leads; connectors [electricity]; wire connectors [electricity]; electrical circuit testers; horns for loudspeakers; spark-guards; electric plugs; high-voltage transformers; weighing, measuring and inspecting apparatus and instruments; thermostats; thermostats for vehicles; sensors; piezoelectric sensors; parking sensors for vehicles; liquid level sensors; pressure sensors; temperature sensors; parking sensors for vehicles; gas sensors; conductivity meters; ultrasonic sensors; accelerometers; acceleration sensors; infrared detectors; vibration sensors; velocity sensors; motion sensors; humidity sensors; charging sensors; flow sensors; photoelectric sensors.