26 LABORATORY EQUIPMENT, COMPRISING CONTAINERS MADE OF PURIFIED GRAPHITE USED FOR OR IN CONNECTION WITH MELTING, CASTING OR REFINING MATERIALS SUCH AS METALS, CERAMICS, AND CHEMICALS-NAMELY, COMBUSTION BOATS, FUNNELS, AND CRUCIBLES FOR USE IN SPECTROSCOPIC ANALYSIS APPARATUS; AND FOR CONTAINERS FOR THE TRANSPORT OF RADIO-ACTIVE MATERIALS