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
内燃凿
深孔凿存在的问题，研制了YNF30型带副缸内燃凿。
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.
针对当前单缸手持内燃凿深孔凿存在的问题，研制了YNF30型带副缸内燃凿。
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，
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