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Damped hammer drill

Tool driving or impacting – Drive controlled by relative axial movement of tool
Patent

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Delayed compression sleeve hammer

Tool driving or impacting – Drive controlled by relative axial movement of tool – Drive motor controlled
Reexamination Certificate

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Delayed compression sleeve hammer

Tool driving or impacting – Drive controlled by relative axial movement of tool – Drive motor controlled
Reexamination Certificate

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Demolition tool

Tool driving or impacting – Drive controlled by relative axial movement of tool – Drive motor controlled
Patent

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Down hole drill improvement

Tool driving or impacting – Drive controlled by relative axial movement of tool – Drive motor controlled
Patent

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Down hole percussion drill apparatus

Tool driving or impacting – Drive controlled by relative axial movement of tool – Drive motor controlled
Patent

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Down the hole hammer equipment

Tool driving or impacting – Drive controlled by relative axial movement of tool – Drive motor controlled
Patent

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Down-the-hole hammer

Tool driving or impacting – Drive controlled by relative axial movement of tool – Drive motor controlled
Patent

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Drill and/or impact hammer

Tool driving or impacting – Drive controlled by relative axial movement of tool
Patent

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