9 Superconducting products, namely, electromagnetic aircraft launch systems consisting of power electronics, linear motors, and controls, superconducting magnetic energy storage systems consisting of vacuum vessels, thermal shields, superconducting cables, superconducting magnets, solar receivers for converting heat energy directly into electricity, systems consisting and solar electrical converters, solar energy storage batteries, charge regulators, inverters, connecting electrical circuits, and module racks; electromechanical fuel cells, namely, proton exchange membrane fuel cells, and solid oxide fuel cells, space power and propulsion, namely, satellite propulsion systems consisting of propellant preheaters, receivers-absorbers-converters, secondary concentrators, advanced insulation materials, multifoil insulation, and graphite felt; and satellite power systems consisting of thermal energy to electricity converters, thermionic diodes, and alkali metal thermal energy converters