| http://www.w3.org/ns/prov#value | - In particular in Europe, the use of lead is inhibited by the regulations such as instruction on used electric and electronic equipments (WEEE) and order on theuse prohibition against harmful substances (RoHS).Therefore, mother glass compositions for a graded index lens not containing lead oxide is disclosed in JP-A-2001-139341 (the term JP-A as used herein refers to an unexamined published
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