| http://www.w3.org/ns/prov#value | - However, a flexible extension member, e.g. in the form of a second tubular conduit closed at one end, may advantageously be mounted at the downstream end of the patient connecting member, which extension member may be connected to the first tubular conduit member by means of a coupling device and thus it can serve to secure the oxygen supply device behind the patient's head.
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