[ Respiratory apparatus for medical purposes; humidification apparatus for medical use; medical apparatus for the treatment of obstructive sleep apnea; ] breathing masks for use in treating obstructive sleep apnea; [ facial masks, oral masks, ] nasal masks, [ nasal cannula, mouthpieces, ] headgear, [ breathing tubes, nasal tubes, tubing connectors, tubes, nasal prongs, ] all being for medical purposes; parts and fittings for all the aforementioned goods