| http://www.w3.org/ns/prov#value | - It is not preferable to carry out the sealing process in the air atmosphere, since when the sealing process is performed in the air atmosphere, if the cathode 503 has a defect, such as a pin hole, formed therein, there is a fear that water, oxygen, or the like enters the cathode 503 from the defect to oxidize the cathode 503.
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