CHEMICALS USED IN SCIENTIFIC LABORATORY ANALYSIS, NAMELY, CATALYSTS AND REAGENTS, NAMELY, MEASURED QUANTITIES OF MAGNESIUM PERCHLORATE, MANGANESE DIOXIDE, PLATINIZED SILICA, RARE EARTH/COPPER OXIDE, ARROWROOT STARCH SOLUTION, VANADIUM PENTOXIDE, CARBON-SULFUR-NITROGEN CHIP STANDARDS; REAGENTS, NAMELY, CALIBRATION STANDARDS, NAMELY, PRECISELY MEASURED AMOUNTS OF NITROGEN/OXYGEN IN STEEL PINS, ZIRCONIUM PINS FOR NITROGEN AND OXYGEN, HYDROGEN IN STEEL, OXYGEN IN COPPER PINS, STEEL BALLS FOR HYDROGEN-OXYGEN, TITANIUM PINS FOR GYDROGEN-OXYGEN-NITROGEN FOR USE IN THE MANUFACTURE OF STEEL; REAGENTS, NAMELY, OIL STANDARDS, HYDROCARBON STANDARDS, COAL AND COKE STANDARDS FOR USE IN THE PETROLEUM INDUSTRY AND IN THE STEEL INDUSTRY; REAGENTS, NAMELY, DRINKING WATER POLLUTANT STANDARDS; REAGENTS, NAMELY, METALLO-ORGANIC STANDARDS FOR WEAR METALS IN OILS, SEDIMENT AND SOIL SOLUTIONS; METAL LABORATORY STANDARDS, NAMELY, PRECISELY MEASURED QUANTITIES OF TIN PELLETS, TIN METAL, IRON POWDER, COPPER METAL TUNGSTEN, COPPER RINGS, TIN COATED COPPER, TIN CAPSULES, ALUMINUM CAPSULES, PRESSED ALUMINUM CAPSULES, PRESSED TIN CAPSULES, PRECLEANED TIN-GRAPHITE-FREE IRON, AND PRECISELY MEASURED QUANTITIES OF CAST, GRAY, MODULAR, DUCTILE, MALLEABLE AND WROUGHT IRON, AND PRECISELY MEASURED QUANTITIES OF SILVER AND PRESSED SILVER CAPSULES