The present invention is directed to a heat-resistant polyester blow-molded article made of a polyester resin composition containing 0. The mass memory comprises a partition that is read-only accessible to the operating system, said partition containing a startup function, an automatic repair function, and a function for mounting said operating system. The fastener flange of the endplate is pierced by ventilation orifices opening out into the air diffusion cavity, the cavity opening out into the slots of the downstream disk at their upstream ends. A plurality of parallel grooves are formed lengthwise andor widthwise along the outer surface of the top panel andor the outer surfaces of the side panels of the outer enclosure case body such that the cross-section of the top panel andor the side panels is a heat-dissipating configuration of rectangular protrusions and depressions. Accumulator accumulates decoded image data and driver circuitry, , drives the columns of the display. An x-ray beam emitted from the focal spot passes through an aperture in the micro-hole collimator, and produces a magnified projection of the focal spot on the detector array.