Niels Christensen
Niels Anton Christensen (16 August 18655 October 1952) was a Danish-American inventor whose principal invention was the O-ring, the ubiquitous hydraulic seal. Provided by Wikipedia-
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2by Umbreen Yousaf, Gerda Engholm, Hans Storm, Niels Christensen, Elisabeth Zetlitz, Henrik Trykker, Frank Sejersen, Peter Bjerregaard, Lau Caspar ThygesenGet full text
Published 2018-08-01
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