The semiconductor device of the present invention includes a first interconnection, a via-plug that is connected to the first interconnection, and a second interconnection that is formed as a single unit with the via-plug. The two IMSI numbers may preferably be stored on a common or on different identification modules. The user can then download or otherwise act on the message at a time and at a place convenient to the user. The adaptive timing system may also comprise an identifying circuit for identifying whether the midpoint of the DVW corresponds to an actual midpoint of the DVW and adjusting the delay circuit accordingly. The cover is constructed and arranged to allow contaminants to pass between the duct forming the exit vent and the cover and into the trough.