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500m Crawler Reverse Circulation Drilling Rig / Air Lift Reverse Circulation Drilling Rig. High drilling efficiency Fast penetration rate, much faster than diamond core drilling. Continuous sample collection Obtain representative cuttings samples continuously convenient sampling. Great adaptability for hard rock Good performance in hard, fractured rock strata. Lower comprehensive cost Low consumable cost, saves time and labour. Suitable for deep exploratory holes Capable for relatively deep prospecting boreholes. Simple on-site sample processing easy recording of drilling depth and sampling position.