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Improvements in or relating to centralisers
Improvements in or relating to centralisers
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机译:扶正器或与扶正器有关的改进
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摘要
A centraliser (110) comprises longitudinally spaced collars (115, 120) connected by a plurality of springs (125), each of the springs (125) comprising two or more bow sections (127, 128, 129).
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