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containing
方钻杆旋 塞
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in specified order only
Subject
Chinese
English
oil
方钻杆上旋塞
upper kelly cock
oil
方钻杆下旋塞阀
lower kelly cock
dril.
方钻杆旋塞
kelly guard
oil
方钻杆旋塞
kelly cock
dril.
方钻杆旋塞
kelly safety valve
dril.
方钻杆旋塞
kelly cocks
dril.
方钻杆旋塞
扳手
kelly cock wrench
dril.
方钻杆防溅旋塞
kelly stop cock
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