A conventional method of pyrolytically decomposing plastic to make low-molecular compounds is poor in efficiency of use of energy due to high heating temperatures. In a level shifter for converting a signal level of a first logic circuit to which a first power source is supplied into a signal level of a second logic circuit to which a second power source is supplied, the circuit includes a switching circuit between a GND power source terminal of a level shift core circuit and a GND power source. A modulation unit executes a modulation process on the encoded Lch data so as to generate an Lch data symbol. The differential gear assembly also includes a first set of friction members, each of which faces a respective one of axial ends of the first set of planetary gears; and a second set of friction members, each of which faces a respective one of axial ends of the second set of planetary gears. When the shield bracket is slid into position to cover the opening, the shield bracket is retained by the plurality of tabs. The third auxiliary seal lines pass only gas such as air and the main seal lines are protected from being damaged from a cleaning detergent or an etchant such as an HF solution during a cleaning and etching process.