A magnetoresistive hybrid memory cell includes first and second stacked structures. The pump includes a housing in which a rotor shaft is rotationally mounted and an impeller for conveying the fuel which is arranged on the rotor shaft. The partition plate extends radially of the starter between an electric motor and a planetary gear train to isolate the planetary gear train from a motor chamber. The probe is connected to a transducer processing circuit capable of supplying, from a Doppler signal, an audio signal by coupling the processing circuit to a loudspeaker in contact with the ear trumpet for stethoscopic-type listening, and a video signal by coupling the processing circuit to display means to provide visual information.