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Machine parts for protecting against explosions, in particular for protecting against gas and dust explosions; machine parts for explosion pressure relief (included in this class); flame arresters (included in this class).;

Regulating, measuring and control apparatus and systems for pressure relief of gas and dust explosions; flame arresters (included in this class).;

Installations for controlling the flow of gases; regulating apparatus for gas apparatus and installations for pressure regulation in the event of gas explosions.;