Niels Christensen, Date of Birth, Place of Birth, Date of Death
TweetNiels Christensen
Danish inventor
Date of Birth: 
Place of Birth: Kingdom of Denmark
About Niels Christensen
- Niels Anton Christensen (16 August 1865 – 5 October 1952) was a Danish-American inventor whose principal invention was the O-ring, the ubiquitous hydraulic seal.
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