Artificial sleep apparatus; Continuous positive airway pressure nasal apparatus for the treatment of sleep apnoea; Apparatus for carrying-out diagnostic tests for medical purposes; Apparatus for medical diagnostic purposes; Apparatus for producing oxygen for medical use; Electrical appliances for medical purposes; Electrodes for medical use; Electronic blood oxygen saturation monitors (for medical use); Electronic blood oxygen saturation recorders (for medical use); Electronic heart rate recorders (for medical use); Electronic heart signal recorders (for medical use); Inhalation devices for medical use; Medical apparatus for assisting breathing; Oxygen enrichment apparatus for medical use; Oxygen masks for medical use; Respiratory breathing apparatus, other than for medical use; Therapeutic apparatus for the administration of oxygen (medical)