prov:value
| - Suitable thermoplastics materials for use in the production of a substrate include a cellulose ester, e.g. cellulose acetate, polystyrene, a polymer and copolymer of vinyl chloride, polysulphone, a homopolymer or copolymer of a 1-olefine, such as ethylene, propylene and but-1-ene, a polyamide, a polycarbonate, and, particularly, a synthetic linear polyester which may be obtained by condensing one
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