File:US390721.png
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![File:US390721.png](http://up.wiki.x.io/wikipedia/commons/thumb/c/c5/US390721.png/384px-US390721.png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 06:02, 10 March 2007 | ![]() | 516 × 806 (51 KB) | Penpen~commonswiki | en:Image:US390721.png 以下は元のファイルの記述 Electric system {{US patent|390721}} {{PD-US-patent}} {{PD-old-50}} |
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