A ventilation device for a fuel tank includes an antisurge element designed as a porous component manufactured from sintered plastic. Namely, if the injected quantity of slippage-preventing particles is adjusted so as not to be excessive and to be a suitable quantity, it is not possible to obtain a predetermined injection pressure and it is not possible to inject the particles at the target location. The nozzle opening is rotatable about the longitudinal axis of the lance such that the coating agent can be dispensed in differenct directions according to an angular position of the nozzle opening. The decoder clock indicates the arrival-time of the data at the system, while the network jitter statistics collector collects the playback-time of that data. The non-overlap buffer connecting to the output terminal of the logic unit comprises at least three inverters connected in a serial, and an output signal of the first inverter coupled to the output terminal of the logic unit is input to an latch unit of the th stage.