| http://www.w3.org/ns/prov#value | - This optical transmission medium 40 fixed with the low-melting point glass 42 to the package base 80 leads to great advantages such as capability of easier sealing compared with the case where the optical fibers are directly fixed to the package base 80, removability of the optical fibers 70 from the package base 80, and capability of easily treating the package after fixing and sealing are carrie
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