In matrix array substrate for flat-panel display devices or the like in which a repair circuit for connecting a defected pixel electrode and next electrode in a tandem is disposed between the two pixel electrodes, a contact hole for connecting one of connector electrodes of the repair circuit to one of the pixel electrodes is disposed within contours of a scanning line. Power for the sensor is generated by scavenging power from fluid flow within a pipe. According to the invention, a common endplate is provided for the radial inner multiple disk clutch and the radial outer multiple disk clutch. This permits the result of non-contacting measurements of films in a continuous production environment to be fed back to adjust the production conditions in order to improve or maintain the quality of subsequently produced film.