Respiratory breathing device; durable medical equipment in the fields of Allergology, Anesthesiology, Cardiology, Dermatology, Emergency Medicine, Endocrinology, Ergonomics, Family and General Practice, Gastroenterology, Gerontology, Internal Medicine, Internal Disorders, Nutrition, Neurology, Obstetrics and Gynecology, Occupational Therapy, Oncology, Ophthalmology, Orthopedics, Pathology, Pediatrics, Physical Therapy, Pulmonology, Psychiatry, Radiology, Respiratory Therapy, Speech Therapy, S...