| 摘要 |
A centralizer (10) comprises a tubular body (12) provided with two spaced apart grooves (18). The ends of spring bows (20) are mounted on collars (24, 26) which are slidably mounted in respective ones of the grooves (18). In use, movement of the spring bow (20) against the tubular body (12) can be accommodated by movement of the collars (24, 26) along the grooves (18).
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