| http://www.w3.org/ns/prov#value | - The materials form air-filled conduits or channels through which gases, such as oxygen and carbon dioxide, can readily exchange by diffusional means between regions of different...http://www.google.com/patents/US6306491?utm_source=gb-gplus-sharePatent US6306491 - Respiratory aidsAdvanced Patent SearchPublication numberUS6306491 B1Publication typeGrantApplication numberUS 09/282,384Publication date
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