Kedu ihe kpatara ịhọrọ Grand ka ọ bụrụ onye China na-ebubata ihe nkuku tri-cone, PDC drill bits, HDD reamers na ndị ọzọ.
Mgbe ị na-enweta ihe enyemaka maka ụlọ ọrụ mmanụ na gas, ịchọta ndị na-ebubata ihe a pụrụ ịdabere na ya na ọnụ ahịa dị oke mkpa. Dị ka otu n'ime ndị na-emepụta China na ndị na-ebubata ya, Grand na-enye ọtụtụ ngwaahịa, gụnyere tri-cone drill bits, PDC drill bits, HDD ream ...
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