7 Motors, other than for land vehicles, aeronautical engines, machine tools for metalworking, machines for making parts intended for rocket propulsion craft or aeronautical machines; industrial robots being machines; electric compressors being machines; heat exchangers being parts of motors other than for land vehicles; electric pumps being part of machines, electric fluid pumps, electric turbopumps and valves for pumps for liquids, hydrazine thrusters, bipropellant thrusters, power-augmented catalytic thrusters; microgravity devices, namely, machines used to create microgravity environments for industrial purposes, thrust propulsion and load mechanisms, namely, loading machines; turbomolecular pumps; couplings for machines other than for land vehicles and transmission and propulsion units excluding those for land vehicles, namely, transmissions for machines, all types of motors and engines for the generation of electricity for fixed or mobile installations excluding those for land vehicles; reaction electric motors for machines, nuclear rocket engines not for land vehicles using propulsion, rocket engines not for land vehicles but for satellite launchers and for missiles, ion thrusters, electric propulsors, plasma rockets, plasma sources, arc jets; propellant tanks, surface tension tanks; thrust reversers being structural components for aircraft engines; structural component parts of these machines, pumps, motors, thrusters and reversers; metalworking machines tools