9 Measuring and testing apparatus and installations built thereof for use in producing pipes, wires, bands, steel rods, billets, rails and sections, namely, scales, ammeters, watt meters, thermometers, water analyzers, gas and air analyzers, automatic chemical analyzers, speed measuring apparatus, namely, speedometers and speed indicators, pressure measuring apparatus, namely, pressure gauges, pressure detectors, and pressure indicators, angle gauges, distance meters, roughness gauges, strip flatness meters, length and thickness measuring instruments for measuring the lengths and thicknesses of wires, rods and bars, metal hardness testing machines, tension testers, stress meters, x ray machines and apparatus not for medical use, namely, industrial x ray apparatus in the nature of testing equipment for determining industrial flaws, x ray tubes, apparatus and instruments for checking the temperature of wires, rods and bars; picking and weighing equipment for pipes, wires, steel rods, billets, rails and sections, namely, electric weighing machines, scales and balances; automatic control systems composed of computers and electronic controls for machines, for production of pipes, wires, bands, steel rods, billets, rails and sections