Motors, actuators, gearboxes, transmissions, reduction units and drive trains to enable an aircraft to be moved, steered, slowed or stopped during taxiing or during the phase prior to take-off or subsequent to landing; motors, actuators, reduction units and drive trains to turn one or more wheels of an aircraft to enable it to be moved, steered, slowed or stopped during taxiing or during the phase prior to take-off or subsequent to landing; electric generators

computer software for tracking the current location of individual measuring gauges used at multiple locations and database management software for maintaining the correct calibrations of gauges by recording the history of maintenance performed for comparison with a pre-programmed schedule of future gauge maintenance intervals and calibration cycles, procedures and requirements that may be downloaded from a global computer network