9 Fuel cells, fuel cell stacks, fuel cell systems, as well as parts of the aforementioned goods; computer programmes for fuel cells, fuel cell stacks and fuel cell systems; electronic current converters; electrodes for fuel cells, fuel cell stacks and full cell systems; membranes for fuel cells, fuel cell stacks and full cell systems; housings for fuel cells, fuel cell stacks and fuel cell systems; control valves for fuel cells, fuel cell stacks and fuel cell systems; check valves for fuel cells, fuel cell stacks and fuel cell systems