SPECTRA-MAT

ELECTRICAL EQUIPMENT-NAMELY, INDUCTION HEATERS; HIGH TEMPERATURE FURNACES; SKULL MELTING FURNACES; ULTRASONIC CLEANERS AND ACOUSTIC MACHINING AIDS AND ELECTRONIC COMPONENTS INCLUDING OXIDE COATED CATHODES; NICKEL-BASE CATHODES; TUNGSTEN DISPENSER CATHODES; RARE-EARTH CATHODES; HEXABORIDE CATHODES; COMPONENTS FOR THERMIONIC ENERGY CONVERTERS AND VACUUM TUBES; CERAMIC SPACERS; CERAMIC SEALS; CERAMIC INSULATION; INSULATORY CERAMIC CEMENTS; FOAM CERAMICS; AND PLASTIC INSULATORS