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???? ???? ???? ?? ????? ????? ???? ?????? 2012-03-21
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????? ???? ?????? 2012-03-19
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????? ?? ?????? ?? ??????? ??? ???? ?????? ?????? ????? ?? ???? ????? ???? ?????? ???? ??????? ?? ??????? ?? ????? 2012-03-14
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ArabicEnglishSpanishAlpha ????? ??????? ????? ???????? ??? ?????? ???? ??????? ????? ?????? ??? ????? ??? ????????. ????? ?? 2012-02-27
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Drill string safety valve 2012-02-06
A multi position safety valve retainable within an internal portion of a drill string casing and responsive to the greater differential pressure in an internal fluid passage to displace a valve head r
Safety valve for fluid systems 2012-02-01
An improved safety valve includes piston-actuated provisions for gradually pressurizing a fluid-actuated motor during start-up of the system, preferably by way of a changeable flow restriction. In add
Surface controlled subsurface safety valves 2012-01-20
Lock-open mechanism for surface controlled subsurface safety valves. A lock-open sleeve can be positioned by wireline techniques to hold open the valve closure means for a subsurface safety valve. The
