9 Measuring and testing apparatus, namely, scales, ammeters, wattmeters, thermometers, water analyzers, gas and air analyzers, automatic chemical analyzers, speed measuring apparatuses, 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 metal pipes, 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, all for use in producing metal pipes, wires, bands, steel rods, billets, rails and sections; weighing equipment, namely, scales and balances for metal pipes, wires, steel rods, billets, rails and sections; automatic pressure control machines for use during the production of metal pipes, wires, bands, steel rods, billets, rails and sections comprised of computers