9 Fuel cell systems, namely, fuel cell stacks, power controllers, power inverters, and energy storage devices, namely, batteries; electrolysis apparatus for laboratory use; Devices and instruments for transforming electrical energy into hydrogen as an energy carrier, namely, proton exchange membrane electrolyzers; parts and accessories for proton exchange membrane electrolyzers namely, electrolyzer stacks for transforming electrical energy into hydrogen as an energy carrier; pumps for use in the generation, transmission, distribution, supply, and storage of hydrogen; valves for use in the generation, transmission, distribution, supply, and storage of hydrogen; transmitters for use in the generation, transmission, distribution, supply, and storage of hydrogen; filters for use in the generation, transmission, distribution, supply, and storage of hydrogen; sensors for use in the generation, transmission, distribution, supply, and storage of hydrogen; downloadable software for use in apparatus and instruments for use in the generation, transmission, distribution, supply and storage of hydrogen; downloadable application software for mobile devices for use in the generation, transmission, distribution, supply, and storage of hydrogen; downloadable software applications for use with mobile devices for use in the generation, transmission, distribution, supply, and storage of hydrogen; downloadable computer software applications for use in the generation, transmission, distribution, supply, and storage of hydrogen.