| http://www.w3.org/ns/prov#value | - In a preferred embodiment, a unitary filter membrane has both a liquid permeable portion of the filter located within the flow path of the liquid-dispensing conduit and a separate portion of the filter which is rendered impermeable to the liquid such as by treatment with a hydrophobic composition to provide the air-permeable liquid obstruction within the second conduit for the air aspiration.
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