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device for the introduction and removal of the elements of the dam, in particular to the dam pools
device for the introduction and removal of the elements of the dam, in particular to the dam pools
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机译:引入和去除大坝要素的设备,特别是向大坝池引入和去除的设备
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摘要
Apparatus for shoring the walls of trenches or ditches including fluid motors carried by a framework and being adapted to cooperate with sheet members for forcing the sheet members into place to support the trench walls and for removing the sheet members after work has been completed.
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