| http://www.w3.org/ns/prov#value | - ratory gas source, the control means including selection means capable of selecting a pressure parameter or a flow rate parameter to define the reference value of the gas related parameter; an inhalation duct to supply gas from the pressurized respiratory gas source to a patient; an expiratory duct for expiratory gas of the patient; an inhalation valve disposed on the inhalation duct, the inhalati
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