| http://www.w3.org/ns/prov#value | - FIG. 2 is a graph for explaining a relation between a product value of a photoelasticity constant, a modulus of tension elasticity and a thickness (mm) with respect to a resin film, and the ratio (???100) of the maximum value to the minimum value with respect to the reproducing signal amplitude during one rotation of an optical disc with an adhesive layer having the thickness of 5 ??m in an embodi
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