| http://www.w3.org/ns/prov#value | - Basically, and referring especially to FIG. 1, the principal of operation of the manifold device of the invention is as follows; On patient inspiration, air or oxygen enriched air is passed from a respirator or IPPB control unit into first port 35, across the central interior of main tube 12 and through second port 37 which is connected by a suitable gas directing conduit such as a flexible hose a
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