| http://www.w3.org/ns/prov#value | - In the present invention, the conditions such as the composition of optical glass, the materials and shapes of the first heat working jig, the second heat working jig and the pressing moulds, the compositions of the films coated thereon, conditions for thermal deformation (temperature, time and atmosphere), the shape of the optical glass preform and so on are not limited to the above-described emb
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