Manometers, Air Data Test Stations in the Nature of Computer Controlled Manometers for Testing Air Operated Devices, [ Air Pressure Generators, Air Pressure Gages, ] Vacuum Gages, [ Capacitance Gages, Leveling Cistern Systems-Namely, Mercury Cisters with Capacitors, a Mercury Filled Line, and Electric Circuitry for Indicating Cistern Level, and Pressure Regulators ]