An electromagnetic control valve has a passage for conducting fluid. Solid state light emitting elements are provided on the mounting substrate. Two segments of one transmission line are charged and switchably coupled to two segments of the other transmission line to produce a bipolar pulse on the matched load. Thus, the circuit board unit and the rack are brought into electrical contact to perform electromagnetic shielding. The second DAC unit supplies the second voltage to the second terminal when the first DAC unit supplies the first voltage to the first terminal. The print pattern is receptive to an ink, and the design layer ink forms a durable image material with good bond to the print pattern, but the ink does not form a durable image material on the portions of the substrate outside the print pattern.