| 摘要 |
A tubular casing which is designed to be stable in an upright position it has a bottom portion with an axial opening into which is forcibly fitted an axial spigot on a base member which engages the bottom portion. An annular ballast weight is fitted around the spigot and is held in place on it by the bottom portion; the ballast weight may have claws on its inside to engage the spigot, which can be of tapering form and has latching members to hold it in the opening.
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