| http://www.w3.org/ns/prov#value | - For a motor vehicle provided with a heater unit HU including a heat exchanger of gas/air type, of type known per se, the battery or matrix MGM of generators may conveniently have an exhaust manifold such as that indicated EM2 in FIG. 2, selectively connectable to the said heat exchanger, for example by means of a solenoid valve device ELV2, likewise controlled by the unit EPMS. This arrangement, g
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