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Anti-buckling device for mine-roof bolting machines

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Apparatus for feeding a drilling machine in extension rod drilli

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Apparatus for moving earth boring machines

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Reexamination Certificate

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Automatic feed and rotational speed control system of a hydrauli

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Bolting rigs

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Reexamination Certificate

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Device in rock or earth drilling apparatus for rotary drilling

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Digger attachment

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Drill depth control device

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Reexamination Certificate

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Drill stem make-up and break-out system for earth drilling machi

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Flexible shaft for a roof drill

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Hydraulic drill feed units

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Hydraulically powered drill press

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Mechanism for tensioning fluid hoses on a rock drill feed

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Methods of and apparatus for winning reef

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Mobile drilling apparatus

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Pile or sheet-pile driver

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Portable earth boring machine

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Portable earth boring machine

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Pressure fluid powered machine tool

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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Raise drill apparatus

Tool driving or impacting – Advance causing or controlling means – Motor causes or controls advance
Patent

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