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for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and
Switzerland. The creator and year of publication are essential information and must be provided. See
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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the
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that is a natural magnet, from 1921 electrical engineering book. The caption of the picture said: "Natural magnet attracting iron nails".
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This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
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The following pages on the
English Knowledge use this file (pages on other projects are not listed):
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Electrical
Machinery: A practical study course on installation, operation, and maintenance, 1st Ed.
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occurred prior to
January 1, 1929, and if not then due to lack of notice or renewal. See
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Public Domain in USA - published in USA prior to 1923
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Commons is a freely licensed media file repository.
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641:Usage on fa.wikipedia.org
630:Elektrizitatearen historia
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22:File history
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545:مغناطيسية
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155:Date
17:File
459:FFT
655:磁石
141:A
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815:磁
805:磁
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