26 FLUXING TUBES, FUEL ELEMENTS, MODERATORS, REFLECTORS, CONTROL RODS, THERMAL COLUMNS AND SHIELDING, ALL FOR NUCLEAR REACTORS; POTENTIOMETERS AND TRIMMERS; FLOW METERS; PRESSURE GAUGES AND PARTS; PRESSURE AND FLOW REGULATORS; TENSILE AND BENDING TESTING MACHINES; GAS PROPORTIONERS; IONIZATION GAUGES; GOGGLES, EYE SHIELDS, VISORS, OPTICAL FILTER AND PROTECTIVE LENSES, MAGNIFIER LENSES AS EYE PROTECTORS; FACE SHIELDS USED IN WELDING AND SIMILAR OPERATIONS; THERMOCOUPLE GAUGES; GAS ANALYZERS; TOTALIZING GAS FLOW METERS; GAUGES; HYGROMETERS; MANOMETERS; PULSOMETERS; WEIGHT SCALES; THERMONETERS; COMPUTERS; CONDUCTIVITY METERS; SPEED INDICATORS; AND TACHOMETERS