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Spiral drill collar with elevator groove and slip groove
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What is a Drill Collar
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Drill Collars ,Spiral Drill Collar,Non-magnetic Drill,Drill Collar and Drill Stem Accessories; Collar-CONTINENTAL STEEL CO.,LTD
New 8-1/2" OD Spiral Drill Collar, Range II for Sale in New Iberia, Louisiana
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8” OD Slick Non-Magnetic Drill Collar 6-5/8” Reg Connection - Saltire Energy
