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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

In general, the contents of United States patents are in the public domain.[1]

In specific cases, patent applicants and holders may claim copyright in portions of those documents. In those specific cases, applicants are required to identify the portions that are protected under copyright, and are additionally required to state the following within the body of the application and patent:[2] [3]

A portion of the disclosure of this patent document contains material which is subject to (copyright or mask work) protection. The (copyright or mask work) owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all (copyright or mask work) rights whatsoever.

The original patent should be checked for the presence of such language before an assumption is made that the contents are in the public domain.

	This image is in the public domain in the United States. In most cases, this means that it was published in the United States prior to January 1, 1923 or that its copyright expired in the United States. Its copyright has also expired in those countries with a copyright term of life of the author plus 50 years.
	This image might not be in the public domain outside of the United States (this especially applies in Germany or Switzerland). The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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