| 摘要 |
The covering has four semicylindrical shells (1,3), each with an angled end at a fixed angle and an enclosing semicircular flange (7,9). Each pair of shells forms a full cylinder angled at one end enclosed by a circular flange formed from two semicircular flanges. The second flange engages over the free end of the first flange, which is accommodated in a groove in the second flange.
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