A tracking system for use with a pipeline includes a scraper having signal generation capability for generating acoustic signals, a plurality of acoustic pressure sensors positioned at intervals along the path traveled by the scraper, and a plurality of local processors positioned at intervals along the path traveled by the scraper. A first metallic lamination can be aligned together with a second metallic lamination with a fluoropolymer in-between. The controller is further configured to collect DVI status information associated with each of the plurality of DVI ports in response to the single DVI diagnostic request. Unnecessary bit line precharging can be avoided. Furthermore, since a transmissive element of a non-transmissive side for an optical beam is arranged at an angle inclined to an optical axis of the optical beam, the transmissive element does not obstruct a path of the optical beam to be diffused. A first insulating interlayer is formed on the data pattern and the gate insulating film.