| http://www.w3.org/ns/prov#value | - Further, each of the filter members 4 and 5 is formed of a nonwoven fabric, a foam (a sponge-like porous body having communicating pores), a woven fabric, a mesh or the like, which is made of a synthetic resin such as polyurethane, polyvinyl alcohol, polypropylene, polyetherpolyamide, polyethylene terephthalate, or polybutylene terephthalate.
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