medical instruments and apparatus; namely, [ respirators and ] devices for aiding in the administration of gaseous anesthetic agents and parts therefor, [ devices for warming and humidifying medical gases, ] devices for precise mixing of compressed air and oxygen, [ and devices for continuous monitoring of blood oxygen saturation level and pulse rate; and cardiopulmonary therapy and topical chemotherapy equipment for applying anesthetic agents and for ventilating mammals; namely, medical positive phase respirators; medical positive-negative phase respirators; medical automatic leak compensating respirators; physiological volume limiting respirators for intensive care; complete volume limiting ventilators for intensive care, having a sensing device connected to the patient, anesthesia ventilators; portable respirators and air compressors; humidifiers and nebulizers; automatic resuscitators; emergency hand resuscitators; pressure reducing regulators; intensive care stands; infant and adult breathing circles; wall outlet valves; pedestals; wheel sets; support arms; cooling and filtration coils; spirometers; portable cases and dispensing bottles for medical use; and masks, tracheotomy fittings, endotracheal adapters, intubation adapaters, ] and component parts and accessories for use with apparatus for the cyclic delivery of gases for inspiratory and expiratory breathing patterns