9 scientific, surveying, optical, weighing, measuring, signaling, control and teaching apparatus and instruments, namely, video cameras, displays, tape tension dinamometers, tape tensioning blades, tape flatner meters, thermometers, speedometers, pressure gauges, angle gauges, distance meters, roughness gauges; control devices, such as flatness control, roughness control, pressure control, tensioning control; control panels for rolling mills, electrical and magnetic detectors, frequency meters; apparatus for recording, transmission or reproduction of sound or images, namely, signal transmitter; blank magnetic data carriers; calculating machines; data processing equipment, namely, data processors, and computers; stored computer programs for controlling rolling mills