Medical apparatus for the treatment of obstructive sleep apnea; Medical apparatus, namely, non-invasive ventilation apparatus and instruments; Medical respiratory masks for use in treating obstructive sleep apnea; Breathing masks for use in treating obstructive sleep apnea; Facial masks for medical purposes, namely, for use in treating obstructive sleep apnea; Oral masks for medical purposes, namely, for use in treating obstructive sleep apnea; Nasal masks for medical purposes, namely, for us...