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Air pressure impact drilling method and apparatus for same

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Patent

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Apparatus for supporting and rotating a down hole tubular

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Patent

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Cable-tool casing hammer

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which...
Patent

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Clamping attachment to a device for driving rod elements of low

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Patent

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Clamping means for a device for driving flexible rod-shaped elem

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Patent

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Coal-compacting power-hammer rod activator

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which...
Patent

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Device for gripping and raising tamping tools or for holding rai

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which...
Patent

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Drill head assembly

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Patent

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Drillhead unit

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Patent

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Electrically operated impact tool

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which...
Patent

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Gripping tool adapted for use with device for driving rod-shaped

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Patent

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Ground rod driver

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which...
Patent

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Ground rod driving apparatus

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which...
Patent

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Hammer for removing gates or risers from castings

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Patent

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Impact devices

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Patent

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Pile driving apparatus

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which...
Patent

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Pile driving apparatus

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which...
Patent

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Pipe gripping device

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Reexamination Certificate

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Pipe gripping device

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Reexamination Certificate

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Portable drilling machine

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Patent

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