Rotary boring-drill.
作者： Howard R Hughes
DOI:
关键词: Drilling 、 Petroleum engineering 、 Engineering 、 Drill
摘要: Patent for new and useful improvement rotary boring-drills that are used drilling wells.
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作者： Howard R Hughes
DOI:
关键词: Drilling 、 Petroleum engineering 、 Engineering 、 Drill
摘要: Patent for new and useful improvement rotary boring-drills that are used drilling wells.