| http://www.w3.org/ns/prov#value | - A device for exchanging first and second substances, in particular an oxygenator or dialyzer, comprising a casing, a stack of alternate layers of semi-permeable membrane layers having a plurality of substantially parallel capillary tubes extending therethrough for flow in one direction and porous tissue layers for flow therethrough in a direction transverse to said one direction, spacer means disp
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