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

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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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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
United States
United States
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current22:04, 18 August 2015Thumbnail for version as of 22:04, 18 August 2015530 × 628 (43 KB)TomahF (talk | contribs)User created page with UploadWizard

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