救援井用大直径贯通式潜孔锤及钻头的研制
甘心
, 殷琨
, 何将福, 殷其雷
Development and test of a large diameter hollow-through DTH air hammer and drill bit used in rescue well
GAN Xin
, YIN Kun
, HE Jiang-fu, YIN Qi-lei
救援井用大直径反循环潜孔锤及钻头