Electrical and electronic controls, namely, electro-hydraulic transducers and electrical sensors and parts therefor, computer systems comprised of computer software and input and output interfaces, test stands, and flight controls for primary and secondary flight control surface actuators; built-in test modules and software therefor; modularized electrical power switching apparatus; electric power distribution systems comprised of automatic power management systems, solid state power controllers and secondary power distribution assemblies, components and controls for aircraft; electromagnetic interference suppression apparatus, electronic speed indicators and sensors; electronic stability augmentation systems for aircraft; pressure transducers; temperature controls; cabin pressure control systems comprised of cabin pressure controller, control panel, pressure relief valve, outflow valve and parts therefor; electronic automatic stabilization equipment for aircraft, spacecraft and watercraft; fight controls and flight directors for electronic or electrical navigation for use in aircraft, spacecraft and watercraft; gas management assemblies; oxygen supply systems comprised of cell stacks, deionizer beds, circulating pumps, face separators and controls and parts therefore; portable life support systems comprised of an oxygen supply, contaminant and carbon dioxide removal controls, temperature and humidity controls, display and control module, radio, battery and parts therefore for space travel; and space suits; electronic static power inverters; electronic static power converters and electric runway light sets; electrochemical cells, namely electrochemical gas generators, electrochemical gas compressors, electrochemical gas sensor cells, and electrochemical power generating fuel units and parts therefor; automatic fluid control valves and temperature and pressure sensors for gas turbine engines; ramjet engine fuel management units to deliver and control the flow of fuel to a ramjet engine; automatic and manual testers for hydromechanical and electronic fuel controls for aircraft engines; fuel controls for stationery gas turbine engines; automatic and manual gas turbine aircraft engine diagnostic analyzers; data acquisition units for collecting, integrating and recording operating data for aircraft, and for engines used in aircraft, marine and land vehicles, stationary land installations, and for vehicle systems namely electric and suspension systems; engine fuel control test stands; environmental controls for space travel and subsurface travel; computerized condition analyzers for life support equipment; rate sensors and gyroscopes sold as part of guidance and/or control systems used in aircraft, missiles and space vehicles; gyroscopes; electronic operating condition monitors; electric power generating plant control simulators; pneumatic, electrical and electronic testers for aircraft propeller hubs, air conditioners, engine fuel controls, engine fuel pumps and aircraft and engine actuators; electronic air inlet controls for aircrafts; electronic aircraft integrated data acquisition units for collecting, integrating and recording data for monitoring, diagnosing and prognosticating aircraft subsystems, overall aircraft performance and performance of the aircraft crew; and parts therefor