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The first patent for the O-ring is dated May 12, 1896, as a Swedish patent. J. O. Lundberg, the inventor of the O-ring, received the patent. [6] The US patent [7] [8] for the O-ring was filed in 1937 by a then 72-year-old Danish-born machinist, Niels Christensen. [9]
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A Wills Ring or Cooper Ring is a form of all-metallic O-ring seal. They are used for extremely arduous service, such as sealing the head gasket of high performance piston engines . Hollow, metallic Wills Rings are used as they have better springback than yielding soft metal seals and higher temperature limits than elastomer O rings.
Hoops have been a popular toy across a variety of cultures since antiquity.. This article is a list of toys, toy sets, and toy systems; the toys included are widely popular (either currently or historically) and provide illustrative examples of specific types of toys.
The U.S. Department of Justice aims to force the sale of Google Chrome, which could fetch as much as $20 billion if a federal judge agrees to the browser's sale, Bloomberg reported, a potentially ...
Herlda Senhouse, the second-oldest resident in the US, died in her sleep on Saturday at 113 years old. Senhouse died at her home in Wellesley, Massachusetts, where she had lived...
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