IC 011. US 013 021 023 031 034. G & S: Carbon for arc lamps; immersion heaters, heaters for baths; heating elements; cooling vats for furnaces; furnaces; shaped fittings for furnaces; heat regenerators; heat exchangers (other than parts of machines)
IC 019. US 001 012 033 050. G & S: Refractory materials; cements; cement for blast furnaces
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