Connecting device for hydraulic stepping drill rod of coal bed methane drilling machine
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creator | HE BO WEI LIUXING YI QIANG LIU JIAN HE JUNGUO TU XUEYANG YU LIJUN MA JINSHENG ZHOU LILI GAO JIASUO CHEN JUNPENG |
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subjects | EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS |
title | Connecting device for hydraulic stepping drill rod of coal bed methane drilling machine |
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