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chum drilling
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Subject
English
Russian
road.wrk.
chum drilling
ударное бурение
el.
chum drilling
бурение канатным буром
road.wrk.
chum drilling
канатное бурение
O&G, oilfield.
four-wing
chum drilling
bit
ударно-канатное крестообразное буровое долото
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