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| - Examples of thermoplastic polymeric media which can be used in the invention are polyamides, polyesters, polyester amides, polyolefines, high-pressure and low-pressure polyethylenes, polypropylenes, polyvinyl chlorides, polyvinylidene chlorides, polychlorofluoroethylenes, polytetrafluoroethylenes, polystyrenes, cellulose acetobutyrates, polyacetals, polycarbonates and others, including copolymers
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