| http://www.w3.org/ns/prov#value | - The open second end 104 is the only means for the exhaled air to escape as will be appreciated below since the four legs 120, 130, 140, 150 are connected to devices, are capped or otherwise not open.A second valve assembly 410 is provided and functions as an inhalation valve in that the valve moves between an open position and a closed position depending upon whether the patient is inhaling or exh
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