Tight line device is a lifting gear.
紧线器是一种起重工具。
The Research on Lifting Mechanism Along a Vertical Line
垂直线提升机构的设计研究
Safe electrical sliding contact line is a kind of lifting.
安全滑触线是起重电气的一种。
Steel body sliding contact line is a kind of lifting accessories.
钢体滑触线是起重配件得一种。
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