4. E - Fixed Constructions
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Drill string holder

E - Fixed Constructions – 21 – B
Patent

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Drill string jar

E - Fixed Constructions – 21 – B
Patent

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Drill string jar apparatus

E - Fixed Constructions – 21 – B
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Drill string jarring and bumping tool

E - Fixed Constructions – 21 – B
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Drill string jarring and bumping tool with piston disconnect

E - Fixed Constructions – 21 – B
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Drill string joint breaking means

E - Fixed Constructions – 21 – B
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Drill string member

E - Fixed Constructions – 21 – B
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Drill string member and method for manufacture

E - Fixed Constructions – 21 – B
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Drill string member with bearings

E - Fixed Constructions – 21 – B
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Drill string mounted rotatable tool and cleaning method

E - Fixed Constructions – 21 – B
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Drill string retrieving apparatus

E - Fixed Constructions – 21 – B
Patent

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Drill string rotation encoding

E - Fixed Constructions – 21 – B
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Drill string safety and kill valve

E - Fixed Constructions – 21 – B
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Drill string safety valve

E - Fixed Constructions – 21 – B
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Drill string separation device

E - Fixed Constructions – 21 – B
Patent

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Drill string shock absorber

E - Fixed Constructions – 21 – B
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Drill string shock absorber

E - Fixed Constructions – 21 – B
Patent

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Drill string shock absorbing apparatus

E - Fixed Constructions – 21 – B
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Drill string shock absorbr with pressurized lubricant system

E - Fixed Constructions – 21 – B
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Drill string shutoff valve

E - Fixed Constructions – 21 – B
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