| http://www.w3.org/ns/prov#value | - The material constituting the filter is not restricted and examples of the material include woven fabrics, knits, nonwoven fabrics, papers and the like, which are made of natural fibers such as silk, cotton, wool, hemp and the like, synthetic fibers such as polyurethane, polyethylene, polypropylene, nylon, polyester, acryl and the like, semi-synthetic fibers, or mixed fibers of two or more of thes
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