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The plunger-type rock-splitting rod is a small mechanical device that uses immense pressure to fracture rocks into predetermined shapes and sizes.
The machine is small and light, with low cost, high work efficiency, and no environmental pollution.
link:https://www.ztmineequipment.com/concrete-splitter/shaanxi-zhongtuo-plunger-expansion-hydraulic.html
Handheld Rock Drilling And Splitting Machine For Mining