| http://www.w3.org/ns/prov#value | - The aperture gasket 52 is composed of a resilient, elastomeric material such as, for example, solid foam such as polystyrene, polyurethane and extruded polystyrene foam, natural and synthetic rubber, polyisoprene, butyl rubber, polybutadiene, nitrile rubber, chloroprene rubber, ethylene propylene rubber, ethylene propylene diene rubber, epichlorohydrin rubber, polyacrylic rubber, silicone rubber,
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