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[ ELECTRIC FURNACES, OVENS, AND HEATERS; FOR RESISTORS AND ELECTRIC HEATING UNITS FOR FURNACES, OVENS AND HEATERS; FOR ] ELECTRIC CONTROLLERS AND REGULATORS OF TEMPERATURE, HUMIDITY, ION CONCENTRATION, CONDUCTIVITY OF FLUIDS, COMBUSTION, RATE OF FLOW AND PRESSURE OF FLUIDS, COMPOSITION OF MIXTURES, ELECTRIC CIRCUITS, ELECTROMOTIVE FORCES, ELECTRIC CURRENTS, AND ELECTRIC IMPEDANCES; FOR ELECTRIC CONTROLLERS OF STEAM-GENERATOR FURNACES, FOR ELECTRIC CONTROLLERS OF STEAM-GENERATION, FOR RHEOSTATS, RESISTORS, ELECTRIC HEATING UNITS, ELECTRIC SWITCHES, IMPEDANCES, SOURCES OF CURRENT, AND ELECTRIC MOTORS; FOR ELECTRIC CONTROLLERS REGULATORS AND GOVERNORS OF SPEED AND FREQUENCY; FOR ELECTRIC CONTROLLERS AND REGULATORS OF FREQUENCY OF ELECTRICAL AND MECHANICAL VIBRATION [ ; AND FOR ELECTRICAL SYNCHRONIZERS ]