An industrial fabric is described which comprises a woven fabric body having opposing ends. Each of the above portions of the slurry supplying apparatus further includes a re-circulation means for keep solutions in a mixed and agitated state. A flexible substrate arranged between the liquid crystal display unit and the main substrate is connected to a surface of the main substrate, which surface is on the side of the reflecting sheet. The test beam undergoes polarization rotation an amount that depends upon the frequency of the test beam. In the vehicle, when the state of the vehicle becomes a running mode indicating a state that the running of the vehicle is permitted, the light is turned off.