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Cyflenwr API darnau drilio ffynhonnau craig dwfn IADC537 9 5/8″(244.5mm)
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Bit botwm API TCI IADC537 9 7/8″(250mm) ar gyfer drilio ffynhonnau craig galed
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Darn craig tricon IADC417 8 1/2″(215.9mm)
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Ffatri API o bit tricone TCI IADC617 5 5/8″ (142.9mm)
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Bit tricon TCI IADC417 17.5″(444.5mm)
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Darn drilio ffynnon API IADC417 12 1/4″(311mm) ar gyfer craig galed
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Ffatri API o ddarnau conau rholer creigiau IADC437 8.5″ ar gyfer drilio
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Darn drilio tricone API IADC437 6″(152mm) ar gyfer drilio ffynhonnau
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Bit tricon TCI IADC447 8 1/2 modfedd (215.9mm)
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Dril cylchdro IADC447 6.5 modfedd (165mm)
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Darn craig tair côn IADC517 10 5/8″ (269mm)
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Darnau tricon cylchdroi IADC517 9 7/8″ (250mm) ar gyfer craig galed