Medical apparatus and instruments, namely, respirators and artificial respiration apparatus; apparatus for medical use, namely, humidifiers; medical apparatus, namely, ventilation and non-invasive ventilation apparatus and instruments; medical apparatus and instruments for continuous positive airway pressure, also known as CPAP, and bi-level therapy; medical apparatus, namely, humidifiers and meters for continuous positive airway pressure, also known as CPAP, and bi-level therapy; medical apparatus, namely, sleep apnea monitors; medical apparatus, namely, facial masks, oral masks, nasal masks, mouthpieces, nasal guards, facial guards, and headgear for use by patients; parts and fittings for all the aforementioned goods