| http://www.w3.org/ns/prov#value | - Such materials as phenolformaldehyde and phenol-urea resins, polymerized vinyl compounds, such as polyvinyl chloride, polyvinyl acetate and the like, cellulose acetate, cellulose nitrate, butadiene-styrene copolymer, butadiene acrylonitrile copolymer, natural rubber and the like can be used.
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