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Shenzhen Metro
By Li Chenyu / hcfire360 October 2019
Line 12 of Shenzhen Metro, with a diameter of 1.2 meters and a rock depth of 16.5 meters - 19.56 meters. The Drillmaster kelly bar is matched with the BG 30. The sample rock is taken out and the sample rock height is 1.78 meters.
