Physiotherapy apparatus, namely, positive expiratory pressure device, bubble positive expiratory pressure device, breathing exerciser, lung expansion device, expiratory therapy device, mucus clearance device, airway clearance device; Respiratory apparatus for medical use, namely, positive expiratory pressure device, bubble positive expiratory pressure device, breathing exerciser, lung expansion device, expiratory therapy device, mucus clearance device, airway clearance device; Respiratory the...