| http://www.w3.org/ns/prov#value | - Usable for the elastic piece are rubbers such as silicone rubber, fluorine rubber, isobutylene-isoprene rubber and nitrile-butadiene rubber; plastic-modified rubbers each obtained by modifying with a plastic to control the modulus of elasticity; rubber-modified plastics each obtained by modifying with a rubber to control the modulus of elasticity; and the like.
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