A milling process for the preparation of fine-particled polyarylene ether ketone comprises milling a porous polyarylene ether ketone having a BET surface area of more than 1 m2g. The fuel inlet valve also includes a fuel valve associated with the first aperture and a fill pipe nipple associated with the first aperture. Thus, it is possible to eliminate current flowing into the charge pump circuit without using a control signal from outside such as a power cut signal and an intermittent signal. Alternatively, the cathode may be biased at a lower potential than the reference potential, and the anode may be biased at a higher potential than the reference potential. Display control portion outputs visual information, which corresponds to the input content determined by input determination portion, to a display portion of the touch panel. Certain compositions and formulations contain a stable amorphous form of solifenacin succinate.