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API 12 1/4 mainchesi hybrid bit for hard rock deep deep oilwell pobowola
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Fakitale ya API 17.5 mainchesi PDC ndi trione hybrid drill bit for deep oilwell
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API 8.5 mainchesi pobowola wosakanizidwa PDC-roller pawiri kwa zovuta zovuta
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9.5 mainchesi Hybrid bit PDC kuphatikiza ndi cone roller pobowola mafuta