9 Measuring, signalling and life-saving apparatus and instruments, namely, oxygen masks not for medical use, protective face masks not for medical purposes, temperature sensors, pressure relief valves for controlling the flow of gas, thermostats; altimeters; speedometers; apparatus for recording, transmission or reproduction of sound or images in aircraft, namely, amplifiers, headphone amplifiers, audio amplifiers, stereo amplifiers, video amplifiers, DVD players, liquid crystal display (LCD) monitors, video displays in the nature of flat panel display screens for mounting in aircraft, video monitors, CD players, tape and video tape players, microphones, audio cables; navigational systems and apparatus for aircraft; flight recording apparatus and instruments, namely, electronic data recorders, tape recorders, digital voice recorders, video cassette recorders, audio recorders, video recorders, magnetic tape recorders, cockpit voice recorders (CVR), flight data recorders (FDR); fire-extinguishing apparatus for aircraft; clothing for protection against injury, accident, irradiation or fire in aircraft; avionics, namely, speed indicators, air pressure controllers, temperature indicators, altimeters, frequency meters, fuel gauges, altitude indicators, vibration meters, oxygen gauges, proximity sensors; flight controls for aircraft; electronic flight control panel; aircraft instrumentation including aircraft cockpit instrumentation and aircraft landing guidance apparatus, namely, speed indicators, air pressure controllers, temperature indicators, altimeters, frequency meters, fuel gauges, altitude indicators, vibration meters, oxygen gauges, proximity sensors; apparatus for the automatic control of aircraft; apparatus for the directional control of aircraft; apparatus for the remote control of aircraft; apparatus for the signalization of aircraft; flight management systems (FMS) comprising computer hardware and software for managing flight data; cockpit displays; computers for managing control devices for aircraft; flight simulators for aircraft; load scales for aircraft; optical signalling units for providing directional guidance to aircraft; communications apparatus for aircraft, namely, intercoms, radios, satellite radios, satellite receivers, satellite transmitters, communications headsets for use with communication radios, intercom systems, or other communications network transceivers; simulators for simulating the operation of aircraft; simulators for training personnel in the flying of aircraft; simulators for training personnel in the ground control of aircraft; simulators for training personnel in the operation of aircraft; buoyancy bags adapted for use with aircraft