4. E - Fixed Constructions
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  6. B
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Drill rod, drill bit, and drilling tool

E - Fixed Constructions – 21 – B
Patent

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Drill rods and coupling devices therefor

E - Fixed Constructions – 21 – B
Patent

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Drill section of a drilling tool

E - Fixed Constructions – 21 – B
Patent

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Drill shoe

E - Fixed Constructions – 21 – B
Patent

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Drill shoe

E - Fixed Constructions – 21 – B
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Drill stabilizer

E - Fixed Constructions – 21 – B
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Drill steel

E - Fixed Constructions – 21 – B
Patent

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Drill steel centralizer

E - Fixed Constructions – 21 – B
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Drill steel centralizer

E - Fixed Constructions – 21 – B
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Drill steel centralizer for coal drill

E - Fixed Constructions – 21 – B
Patent

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Drill steel clamping apparatus

E - Fixed Constructions – 21 – B
Patent

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Drill steel for use with percussive tools

E - Fixed Constructions – 21 – B
Patent

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Drill steel for use with percussive tools

E - Fixed Constructions – 21 – B
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Drill steel guiding and centralizing mechanism

E - Fixed Constructions – 21 – B
Patent

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Drill steering apparatus

E - Fixed Constructions – 21 – B
Patent

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Drill steering apparatus

E - Fixed Constructions – 21 – B
Patent

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Drill stem arrangement and method

E - Fixed Constructions – 21 – B
Patent

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Drill stem breakout method and apparatus

E - Fixed Constructions – 21 – B
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Drill stem cleaner

E - Fixed Constructions – 21 – B
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Drill stem connection

E - Fixed Constructions – 21 – B
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