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I-API 7-1 Drilling String Valves
Ama-valve ezintambo zokubhoboza avimba uketshezi ukuthi lungagelezi luye phezulu kwentambo yokubhoboza kaningi uma i-drill ikhahlela kancane kancane. , I-valve yokuntanta.
Ama-valve ezintambo zokubhoboza avimba uketshezi ukuthi lungagelezi luye phezulu kwentambo yokubhoboza kaningi uma i-drill ikhahlela kancane kancane. , I-valve yokuntanta.
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