prov:value
| - The protective material 4 can be formed from any material so long as it can be applied for an ordinary protective material, and can be formed specifically from polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinylidene chloride, acrylic polymer such as polymethyl methacrylate, etc., polystyrene, polyvinylbutyral, acetylcellulose, styrene-butadiene copolymer, polyethylene, polypropy
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