9 LABORATORY PORCELAIN AND OTHER CHEMICAL ITEMS MADE OUT OF CERAMIC MATERIALS, NAMELY COMBUSTION TUBES, HIGH FREQUENCY CRUCIBLES, CAPILLARY AND PYROMETER TUBES; AND WEAR PARTS MADE OF CERAMIC, NAMELY SEALING AND CONTROL DISCS, SEAL RINGS, PUMP PISTONS AND ARMOR PLATE LININGS, CERAMIC COMPONENTS OF ELECTRICAL AND ELECTRONIC APPARATUS, NAMELY RESISTOR BODIES, COIL BOBBINS, SLEEVES, SUBSTRATES FOR THICK AND THIN FILM APPLICATIONS, METALIZED SUBSTRATES, TUBES FOR VACUUM SWITCHES, SURGE ARRESTER TUBES, DOUBLE AND MULTI-LAYER CHIP CARRIERS, PIN GRID ARRAYS, TUBES AND PIPES WITH ROUND AND PROFILED CROSS-SECTIONS FOR USE IN ELECTRICAL RESISTORS, TUBE SOCKETS, AND RECTIFIER HOUSINGS; PIEZO BUZZERS, PIEZOLECTRIC CERAMIC COMPONENTS FOR THE TRANSFORMATION OF ELECTRICAL ENERGY INTO MECHANICAL ENERGY AND VICE-VERSA, NAMELY PIEZO CERAMIC FILTERS AND RESINATORS, PRESSURE AND ACCELERATIN SENSORS, AND ELECTRIC IGNITORS, CERAMIC SUBSTRATES FOR WIRING AND ELECTRIC COMPONENTS