9 electrical apparatus and instruments for the chemical, pulp and paper industries, namely electric and electronic controls for chemical recovery, pollution controls for chemical recovery, pollution control and energy generating plants; rectifiers, power and motor controls, generators, switches, circuit breakers; contorl unit for lighting, heating, steam generation, heat treatment, refrigertion, drying and ventilation for use int he chemical, pulp and paper industries; control unit for production of combustible gases and for monitoring such processes, all of the foregoing for use in the chemical, pulp and paper industries