| http://www.w3.org/ns/prov#value | - The term ???spacer??? layers in the present invention is a layer through which blood flows more easily compared with the blood treating filter layer, and those-used are such as a coarse net-like metal, a synthetic resin, an inorganic fiber, a synthetic fiber, or a nonwoven fabric made of a fiber having a diameter larger than a nonwoven fabric used in the blood treating filter layer and the like.
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