A gas exchange valve arrangement, especially for an internal combustion engine, with a valve head, which is mounted on a valve body. A controller controls operation of the light source in response to an external control signal. Two spaced projections are formed on one end of the stiffener. Applicant also discloses a method for constructing a closed container that may be easily modified to remove the cans of the container. The fourth transistor includes a seventh sourcedrain coupled to the first terminal, an eighth sourcedrain coupled to the output terminal and a fourth gate coupled to a refresh signal to set a voltage level of the shift-register unit in a standby mode.