Original Title: Down-the-hole Hammer Cluster Guangdong Zhongke Zhenyu 1000 MM Appears at the Shanghai BMW Exhibition Made in China, Guangdong Zhongke Zhenyu Machinery R & D big bore Cluster Dth Hammer is favored by friends at home and abroad! At the BMW exhibition in Shanghai in 2018, the 1000 MM big bore cluster down-the-hole hammer exhibited by Guangdong Zhongke Zhenyu Machinery Co., Ltd....
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