Mobile assembly for meshing with a toothed starter ring gear of a heat engine comprises: a drive unit provided with a pinion ; a starter drive element ; a pivoting control lever including a lower forked end having two arms; and a friction clutch, pinion being rotationally fixed with a casing partially housing the drive element and comprising the reaction plate of the clutch. Compositions that may comprise the complex and have use as nutraceuticals are obtainable from milk or milk fractions and form a further aspect of the invention. The second amplifier amplifies a peak component of the RF input signal according to a voltage applied to a supply terminal thereof. Each second supporting unit has a third retractable device therein for securing a second mattress. When the pressure limit is exceeded, the male element spring is extended until the seal is broken, relieving the overpressure condition.