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SCIENTIFIC LABORATORY COMBUSTION FURNACES; VARIOUS GLASS PARTS FOR LABORATORY USE-NAMELY, FUNNELS, BURETTES, PIPETTES, VESSELS, JARS; INSTRUMENTS FOR CHEMICAL ANALYSIS-NAMELY, ANALYTICAL INSTRUMENTS FOR THE DETERMINATION OF CARBON, SULPHUR, PHOSPHORUS, SILICON, MANGANESE, OXYGEN, HYDROGEN, NITROGEN, NITROGEN OXIDES AND PROTEIN; BALANCES; ACID TESTING INSTRUMENTS; INSTRUMENTS FOR THE PREPARATION OF METALLOGRAPHIC SPECIMENS; COMBUSTION BOATS, COMBUSTION TUBES, SHIELDS, SHROUDS, TUNDISH NOZZLES, CRUCIBLES, CORES, CERAMIC LABORATORY VESSELS AND LABORATORY GLASS TUBING