Abstract: A heat exchanger for a motor vehicle cooling system includes a sleeve-like meter heretically mounted on, and surrounding, a hollow tubular chassis meter of the vehicle. The sleeve is provided with inlets and outlets communicating with the space between the sleeve and the chassis meter and vehicle coolant flows through the inlet and outlet. Air, flowing over the outside surface of the sleeve and the inside surface of the chassis meter, cools the vehicle coolant.

Abstract: A chassis for vehicles, notably for motor vehicles, is characterized in that it includes a rigid base frame 2 and two absorption zones 4, 6 at the front and the rear associated with the frame 2 and in that said frame 2 and the absorption zones 4, 6 have a cell-like unitary structure.

Abstract: The invention concerns a security arrangement intended for the opening and/or closing of at least one door of an automotive vehicle, characterized in that it includes: at least one control keyboard (2) integrated into the coach-work of the vehicle and intended for the introduction of an opening and/or closing code, said keyboard being provided with sensing elements (6) responsive to the touch and furnishing a code corresponding to the actuated keys, a circuit (30, 32, 34, 44) adapted to generate a control signal in response to said code furnished by the control keyboard; and actuating means (36, 38) controlled by said control signal and assuring the latching and/or unlatching of said door.