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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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Drill head assembly

Tool driving or impacting – Impacting devices – Impact transmitting anvil
Patent

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Drill head unit

Tool driving or impacting – Means to drive tool about an axis – Gear drive
Patent

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Drill head unit

Tool driving or impacting – Means to drive tool about an axis – Gear drive
Patent

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Drill head unit

Tool driving or impacting – Means to drive tool about an axis – Gear drive
Patent

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Drill head with integral impact hammers

Tool driving or impacting – Impacting devices – With means for rotating tool
Patent

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Drill machine table

Tool driving or impacting – Means to drive tool about an axis – Gear drive
Patent

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Drill mounting device for backhoe attachments

Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent

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Drill or chisel hammer

Tool driving or impacting – Drive adjustable to completely change kind of drive – Adjustable to impacting device
Reexamination Certificate

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Drill rig

Tool driving or impacting – With vehicle support for drive – Drive structure moved to nonuse position for transport
Patent

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Drill rig apparatus

Tool driving or impacting – With indicating or signaling means
Patent

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Drill rig assembly

Tool driving or impacting – With indicating or signaling means
Patent

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Drill rig having alternate spindle drive

Tool driving or impacting – Automatic control of power operated means
Patent

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Drill rig having automatic spindle stop

Tool driving or impacting – Automatic control of power operated means
Patent

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Drill rig mast structure

Tool driving or impacting – With vehicle support for drive – Drive structure moved to nonuse position for transport
Patent

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Drill rig shut-off system

Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent

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Drill rig with carrier/mast safety interlock

Tool driving or impacting – With vehicle support for drive – Drive structure moved to nonuse position for transport
Patent

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Drill rig-casing driver assembly

Tool driving or impacting – Drive by means reacting to rotating eccentric mass
Patent

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Drill rod for percussion drilling

Tool driving or impacting – Impacting devices – Impact transmitting anvil
Patent

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Drill rod for percussion drilling

Tool driving or impacting – Impacting devices – Impact transmitting anvil
Patent

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