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Yn27c Mine Tunnel Hand Held Internal Combustion Pneumatic Rock Drill Machine Hydraulic Gasoline Petrol Jack Hammer Rock Drill for Mining and Breaking, Find Details and Price about Rock Drill Gasoline Rock Drill from Yn27c Mine Tunnel Hand Held Internal Combustion Pneumatic Rock Drill Machine Hydraulic Gasoline Petrol Jack Hammer Rock Drill for Mining and Breaking - Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.