| http://www.w3.org/ns/prov#value | - The first stage allows the air to pass through the liquid filtering media, such as water, and then pass through a solid filtering media,...http://www.google.es/patents/US7404401?utm_source=gb-gplus-sharePatente US7404401 - Water respirator filter B???squeda avanzada de patentes N???mero de publicaci???nUS7404401 B1Tipo de publicaci???nConcesi???n N???mero de solicitudUS 11/150,536 Fecha de publica
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