| http://www.w3.org/ns/prov#value | - However, the same advantageous effect can be obtained even with the use of the so-called Z type retardation film formed by multiaxial drawing of polycarbonate (PC) such that a relationship of the respective refractive indices is expressed by the formula, nx>nz>ny, or with the use of a retardation film formed by drawing material such as polyvinylalcohol (PVA), polypropylene (PP), acrylic resin, pol
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