A labyrinth seal includes a first disc and a second disc spaced axially from the first disc such that an axial intermediate chamber is formed between the first and the second discs. A first ring connected with the first disc so as to extend generally toward the second disc and into the axial chamber.....
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http://www.wipo.int/patentscope/search/en/detail.jsf?docId=WO15/001386
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