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Humidification apparatus for medical purposes; medical apparatus for the diagnosis and treatment of obstructive sleep apnea; medical apparatus and instruments for positive pressure therapy; humidification apparatus and meters therefor for medical purposes for use in positive airway pressure therapy; respiratory masks for medical purposes, namely, breathing masks for use in treating obstructive sleep apnea disorder; facial masks, oral masks, nasal masks, nasal cannula, mouthpieces, headgear, all being for medical purposes; parts and fittings for all the aforementioned goods