9 Scientific, weighing, measuring, signaling and monitoring apparatus and instruments for use in the steel and iron industry, steelworks industry, namely, front tension indicators, band tension indicators, band flatness indicators, tachometers, pressure gauges, goniometers, roughness indicators, control devices namely flatness control, roughness control, pressure control, tension control, video cameras, displays, namely electric luminescent display panels, light emitting diode displays, liquid crystal displays, strip tension dinamometers, strip tensioning laboratory blades, strip flatner meters, thermometers, speedometers, angle gauges, distance meters, roughness gauges, control panels for rolling mills, electrical and magnetic detectors, frequency meters; apparatus for recording, transmission or reproduction of sound or images, namely, signal transmitter; calculating machines for use in rolling mills, rolling machines, forging machines and presses, and plastics processing and converting machines; data processors and computers; computer programs used to control continuous casting machines, rolling machines, forging machines and presses, and plastics processing and converting machines used in the steel, iron and steelworks industry