1. 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.
   针对当前单缸手持式内燃凿岩机深孔凿岩存在的问题，研制了YNF30型带副缸式内燃凿岩机。

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