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Subsurface measurement apparatus, system, and process for...

E - Fixed Constructions – 21 – B
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Subsurface probe system for chemical and mineral exploration

E - Fixed Constructions – 21 – B
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Subsurface release cementing plug apparatus and methods

E - Fixed Constructions – 21 – B
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Subsurface safety valve

E - Fixed Constructions – 21 – B
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Subsurface safety valve

E - Fixed Constructions – 21 – B
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Subsurface safety valve

E - Fixed Constructions – 21 – B
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Subsurface safety valve

E - Fixed Constructions – 21 – B
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Subsurface safety valve

E - Fixed Constructions – 21 – B
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Subsurface safety valve actuation pressure amplifier

E - Fixed Constructions – 21 – B
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Subsurface safety valve apparatus

E - Fixed Constructions – 21 – B
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Subsurface safety valve of minimized length

E - Fixed Constructions – 21 – B
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Subsurface safety valve system with hydraulic packer

E - Fixed Constructions – 21 – B
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Subsurface safety valve with improved balancing valve means

E - Fixed Constructions – 21 – B
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Subsurface safety valve with lock-open system

E - Fixed Constructions – 21 – B
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Subsurface signal transmitting apparatus

E - Fixed Constructions – 21 – B
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Subsurface transient pressure testing apparatus

E - Fixed Constructions – 21 – B
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Subsurface valve

E - Fixed Constructions – 21 – B
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Subsurface well apparatus and method

E - Fixed Constructions – 21 – B
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Subsurface well apparatus having flexing means and method of...

E - Fixed Constructions – 21 – B
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Subsurface well bore packing element

E - Fixed Constructions – 21 – B
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