| http://www.w3.org/ns/prov#value | - In an embodiment, in order to connect one side of the first board 111 and one side of the third board 120 to each other and to connect one side of the second board 112 and the other side of the third board 120 to each other, solders such as SnPb are printed to the region in which one side of the first board 111 and one side of the third board 120 are to be connected to each other, and to the regio
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