4. E - Fixed Constructions
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Safety shear apparatus and method for production wells

E - Fixed Constructions – 21 – B
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Safety shield for rotary drilling rigs

E - Fixed Constructions – 21 – B
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Safety sleeve for a borehole communicating with an...

E - Fixed Constructions – 21 – B
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Safety slip ram

E - Fixed Constructions – 21 – B
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Safety switch for well tools

E - Fixed Constructions – 21 – B
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Safety switching system for clamping devices for pipes

E - Fixed Constructions – 21 – B
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Safety system

E - Fixed Constructions – 21 – F
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Safety system

E - Fixed Constructions – 21 – B
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Safety torque tubing hanger and safety torque tubing drain

E - Fixed Constructions – 21 – B
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Safety valve

E - Fixed Constructions – 21 – B
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Safety valve

E - Fixed Constructions – 21 – B
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Safety valve

E - Fixed Constructions – 21 – B
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Safety valve

E - Fixed Constructions – 21 – B
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Safety valve apparatus and method

E - Fixed Constructions – 21 – B
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Safety valve apparatus and method

E - Fixed Constructions – 21 – B
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Safety valve apparatus for rotary drilling equipment

E - Fixed Constructions – 21 – B
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Safety valve controller method and apparatus

E - Fixed Constructions – 21 – B
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Safety valve for an oil well, and tooling for operating said...

E - Fixed Constructions – 21 – B
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Safety valve for drill stem testing

E - Fixed Constructions – 21 – B
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Safety valve for oil well

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