| 摘要 |
An overlapping region is located between an upper casing flange and a lower casing flange such that an outer end of lower casing flange is identical in alignment to an imaginary line passing through an outer end portion of the upper casing flange and being parallel to a side wall of an upper casing, or such that alignment of the outer end of the lower casing flange is at a side of the side wall of the upper casing. |
