The device can realize the automatic and continuous telescopic motion of the suspension arm of the crane only by flipping one switch.
本实用新型只需扳动一个开关，起重机吊臂的伸缩动作可自动连续完成。
The device can realize the automatic and continuous telescopic motion of the suspension arm of the crane only by flipping one switch.
本实用新型只需扳动一个开关，起重机吊臂的伸缩动作可自动连续完成。
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