A fuel cap closes the fuel supply inlet of a filler neck at a narrow operating angle, improving the sealing properties of a gasket. Adjustment of the dead time when both transistors are off is carried out by providing Kelvin feedback connections directly across the drain and source of one or both of the transistors, so bypassing signal line resistance and inductances. The apparatus includes a communication unit for sending and receiving a data packet through the air, and a control unit that outputs a control signal for controlling the transmission power according to connection information of the data packet received through the communication unit. The first voltage is provided to the sense amplifier. This allows the user to manipulate messages in each of the individual accounts using the integrated mailbox without having to access the various accounts individually. In the corresponding method for marking copper-clad laminates a laser beam is expanded, and the expanded laser beam is focused on the surface of a workpiece in the form of a copper-clad laminate, with the laser intensity inside laser resonator being controlled by a screen.