A thin film made of silicon or another IV-group crystals is twice scanned with a laser beam moving in two lateral directions in which crystal grains grow larger in order to form high-quality polycrystals in exact positions in the thin film, while defects uncontrollable by the prior arts are being reduced significantly, to realize a high-quality TFT device. Also described are methods of synthesizing natural products and novel, structurally-related chemical compounds. These signals are connected to the inputs of a phasefrequency detector which produces output pulses in response to the relationship between fREF and fRES. The first housing is adapted to provide a fluid to the EGR and oil cooler cavities. The weak seal portion is formed by joining the one side of the first medical solution storage chamber forming portion and the one side of the second medical solution storage chamber forming portion. This wireless sensor system includes a wireless sensor unit and a sensor signal receiving unit.