YNF30 Jackdrill with caunter-cylinder is developed with the aim at resolving the problem existing in the deep-hole drilling by single-cylinder hand diesel jackdrill.
前单缸手持式内燃
岩机深孔岩存在的问题，研制了YNF30型带副缸式内燃岩机。
YNF30 Jackdrill with caunter-cylinder is developed with the aim at resolving the problem existing in the deep-hole drilling by single-cylinder hand diesel jackdrill.
前单缸手持式内燃岩机深孔岩存在的问题，研制了YNF30型带副缸式内燃岩机。
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