Electrical apparatus not included in other classes; crucibles; apparatus and appliances (not included in other classes) wholly or partly of carbon, for metallurgy and metal-working, or for heat-treatment in chemical, glass-melting, enamelling, dental, electric-lamp making and other industrial or scientific processes; instrument parts (not included in other classes) made wholly or partly of consolidated aggregates or masses comprising carbon, metal, or carbon and metal;
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