| 摘要 |
A structural unit that is specially formed to include four welded corner sections, which can be temporarily connected together in pairs to form two smaller units for transportation to the point of use, and which can then be assembled together to form a large rectangular structural unit that may have a variety of uses, such as in conveying fluids, or in the construction of buildings, bridges or the like, or in forming tunnels, shafts or the like.
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