| http://www.w3.org/ns/prov#value | - For example, a single yarn or twist yarn made of a rubber such as natural rubber of synthetic rubber, or polyurethane is adequate, and the synthetic fiber yarn (non-elastic filament) to be wound around the core can be a tenacious yarn of nylon, polyester or polytetrafluoroethylene (???Teflon???), etc., or a highly tenacious yarn of a polyimide or polyethylene, etc.
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