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for subject
Metallurgy
containing
岩 心 钻
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in specified order only
Chinese
English
孕镶金刚石
岩心钻
头
diamond-impregnated core drill bit
岩心
取心
钻头
hollow bit
岩心钻
头
jack bit
岩心钻
头
coring bit
岩心钻
头
core drill bit
金刚石
岩心钻
头
diamond-impregnated core drill bit
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