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A device for the continuous change of the passage cross sections for solid, liquid or gasfoermige media for the purpose of the filtering, sputtering and volatizing or for shutting off, or inductors of to liquids and gases
A device for the continuous change of the passage cross sections for solid, liquid or gasfoermige media for the purpose of the filtering, sputtering and volatizing or for shutting off, or inductors of to liquids and gases
