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A device for electro - magnet, which makes it possible to obtain a constant magnetic flux with the aid of an excitation which is variable and more generally of a magnetic flux given in order to give to the ratios of new with the excitation
A device for electro - magnet, which makes it possible to obtain a constant magnetic flux with the aid of an excitation which is variable and more generally of a magnetic flux given in order to give to the ratios of new with the excitation