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FR2591654A1
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DEVICE FOR MAINTAINING THE RECTITUDE OF A DRILL
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CA1224682A
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Downhole drilling hammer
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EP0088705A1
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Down-the-hole pneumatic hammer
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EP0083287A1
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Hard material button-type insert for drill bits
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FR2490571A1
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HYDRAULIC CONTROL DEVICE FOR DRIVING AND DIRECTING A TRACKED VEHICLE
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EP0005384A1
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Down-hole air hammer comprising a drill bit
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ES434789A1
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Detaching device of tubes in a drilling or polling machine. (Machine-translation by Google Translate, not legally binding)
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DE2505986A1
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DEVICE FOR DISCONNECTING DRILL PIPES IN A DRILLING MACHINE
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ES390886A1
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Procedure and device for drilling holes in the soil with the help of a martinete. (Machine-translation by Google Translate, not legally binding)
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ES375052A1
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Pneumatic drill for boring
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