A wireless Local Area Network provides data service through a data LAN and also provides video broadcast service through a video LAN. The technical problem mainly addressed in the present invention is to overcome the defects presented in the prior art including low yield and selectivity of lower olefins as the target products, and short regeneration period of catalyst. In addition, the flat panel display device may be manufactured by patterning a gate electrode, sourcedrain electrodes and a pixel electrode using the same etchant composition. The tool movement sequence includes a plurality of sequentially-progressing tool movements. Since this heat treatment is lower than the temperature which the gate wiring withstands and the gate wiring is protected with a protective film, the gate wiring retains its low resistance.