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Subsurface annulus safety valve

E - Fixed Constructions – 21 – B
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Subsurface apparatus for automatically filling conduit strings

E - Fixed Constructions – 21 – B
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Subsurface borehole evaluation and downhole tool position...

E - Fixed Constructions – 21 – B
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Subsurface connection methods for subsurface heaters

E - Fixed Constructions – 21 – B
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Subsurface control valve

E - Fixed Constructions – 21 – B
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Subsurface device actuators

E - Fixed Constructions – 21 – B
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Subsurface electrical heaters using nitride insulation

E - Fixed Constructions – 21 – B
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Subsurface formation plugging

E - Fixed Constructions – 21 – B
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Subsurface glycol injection system

E - Fixed Constructions – 21 – B
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Subsurface injection tool

E - Fixed Constructions – 21 – B
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Subsurface lubricator and method of use

E - Fixed Constructions – 21 – B
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Subsurface lubricator and method of use

E - Fixed Constructions – 21 – B
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Subsurface measurement apparatus, system, and process for...

E - Fixed Constructions – 21 – B
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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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