IC 017. US 001 005 012 013 035 050. G & S: Electrical insulating materials; ceramic electrical insulators; ceramic spacer sheets used for preventing seizure in the calcining process of ceramic products
IC 019. US 001 012 033 050. G & S: Non-metallic minerals for building or construction; ceramic building materials in the nature of ceramic board and ceramic siding; bricks; refractory products not of metal, namely, ramming mixes, refractory castable mixes, fired refractory materials, ceramic shapes for use in refractory furnaces, refractory blocks, all not of metal; boards and powders for building purposes made of inorganic non-asbestos fibers, namely, silicon carbide whiskers and silicon nitride whiskers
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