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Excavator Three -segment or Extended arm

Product introduction
Three or more extended arm of a digger - usually used for low-lying or high-altitude demolition work. 
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Product details

Product delail 

The extened arm of the digger is commonly known as the three-segment extended arm, the long arm of the excavator and the dismantling machine
The extension arm of the demolition machine is divided into big arms, middle arms, small arms and three sections, and the extension arm of the demolition machine is used for the disintegration of high-rise buildings.