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File:Niels Christensen - from the National Engineer - August 1906.JPG

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Summary

Description
English: Niels Anton Christensen, inventor of the o-ring
Date
Source August 1906 edition of the National Engineer
Author National Engineer publication

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Public domain
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United States
United States
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 rule of the shorter term 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 Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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Niels Christensen

inception

1 August 1906Gregorian

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current22:04, 18 August 2015Thumbnail for version as of 22:04, 18 August 2015530 × 628 (43 KB)TomahFUser created page with UploadWizard

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