Image:US390721.png

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en:Image:US390721.png 以下は元のファイルの記述 Electric system U.S. Patent 390721, patent by Nikola Tesla (10 July 1856 – 7 January 1943), United States.

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Public domain This work is in the public domain in the United States and the source country. In most cases, this means that its copyright expired under the law of the source country and it was either published prior to January 1, 1923 or its copyright also expired under the law of the United States. Its copyright has also expired in those countries with a copyright term of life of the author plus 50 years or less.
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current06:02, 10 March 2007516×806 (51 KB)Penpen (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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