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Apparatus for determining the curvature of an elongated hole

E - Fixed Constructions – 21 – B
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Apparatus for detonating shaped charges

E - Fixed Constructions – 21 – B
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Apparatus for directing and steering the foremost part of a...

E - Fixed Constructions – 21 – B
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Apparatus for directional drilling

E - Fixed Constructions – 21 – B
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Apparatus for directional drilling

E - Fixed Constructions – 21 – B
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Apparatus for directional drilling of subterranean wells

E - Fixed Constructions – 21 – B
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Apparatus for disintegrating and removing layers of earth,...

E - Fixed Constructions – 21 – C
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Apparatus for dispensing chemicals into oil and gas wells

E - Fixed Constructions – 21 – B
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Apparatus for downhole measurements, and methods of using same

E - Fixed Constructions – 21 – B
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Apparatus for drifting openings in hard rock

E - Fixed Constructions – 21 – C
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Apparatus for drilling a curved lateral bore deviating from...

E - Fixed Constructions – 21 – B
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Apparatus for drilling a curved subterranean borehole

E - Fixed Constructions – 21 – B
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Apparatus for drilling curved sections of well holes

E - Fixed Constructions – 21 – B
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Apparatus for drilling deep bore holes in bedrock

E - Fixed Constructions – 21 – B
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Apparatus for drilling holes deviating laterally from a...

E - Fixed Constructions – 21 – B
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Apparatus for drilling holes in earth surface

E - Fixed Constructions – 21 – B
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Apparatus for drilling in earth covered rock

E - Fixed Constructions – 21 – B
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Apparatus for drilling into the sidewall of a drill hole

E - Fixed Constructions – 21 – B
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Apparatus for drilling lateral drainholes from a wellbore

E - Fixed Constructions – 21 – B
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Apparatus for drilling machine alignment

E - Fixed Constructions – 21 – B
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