| 摘要 |
A plurality of conductor rings (16a, 16b, . . . , 16n) disposed concentrically with respect to a rotation axis X, and opposite terminals (19a, 19b, . . . , 19n) for coming into contact with the above-described respective conductor rings are provided, and these conductor rings and opposite terminals which come into contact with each other are connected to any one of electric circuits on a side of the above-described display section and on a side of the base section, respectively.
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