Abstract: This reservoir is provided with a fluidtight covering of metal sheets (6) welded together by their edges and supported by beams (2) each comprising two section elements (16, 17), and three longitudinal channels. In cross-section, the first and second section elements each have the shape of a U, the second section element being substantially narrower than the first element and being fixed by the edge of its branches (18) to the bottom (19) of the first section element so as to define an inspection channel (20) having a closed cross-section, and two draining channels (21) having an open cross-section. The surface of the bottom of the second section element (17) which faces toward the exterior of the beam, is contained in the same plane as the edges (11) of the branches (22) of the first section element (16) so as to form the bearing surface (14) for two sheets (6) in the region of their weld head (15) which interconnects them.

Abstract: A direct-current micromotor is disclosed which comprises a rotor bearing a motor winding, the rotor being arranged for rotation between a core part and a mantle part of a stator structure. The core part comprises a permanent magnet and the mantle part is made of magnetically conductive material. The motor winding is fed through a commutator comprising a collector and associated brushes. At least a part of the surfaces of the stator facing the rotor winding are provided with an electrically conductive coating to reduce the height of the voltage peaks occuring during the commutation.