| http://www.w3.org/ns/prov#value | - The protective film 15 may be included to prevent exposure of the metal electrode 14. [0050] The protective film 15 has a single-layer structure of a moisture-absorbing layer or a moisture-proof layer, or a multi-layer structure built with said two layers. [0051] The heat-exhausting layer 21 may be formed by depositing, coating or taping a carbon group material or other material having a good ther
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