| 摘要 |
A housing includes a first and second truncated cone-shape member. Each has a converging end and a diverging end. The converging ends are joined together to form a neck portion. A non-stretchable hoop is provided around on the neck portion. The diverging end of the first truncated cone-shaped member has a first flange with an annular groove thereof and the diverging end of said second truncated cone-shaped member has a second flange portion which is insertable into said annular groove. Two plates are respectively mounted on the flange portions to hermetically seal the housing.
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