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Damper pressure control apparatus for hydraulic rock drill

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

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Device and method for installing ducts in holes produced by soil

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

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Device for introducing additional air into intake passage leadin

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

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Device for soil sampling under water

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

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Device for the production of earth holes

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

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Drill feed control utilizing a variable overcenter valve

Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
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 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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Drilled hole end adjusting arrangement

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

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Dual motor torque delivering tool

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

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Dual speed transmission for automatic assembly machine

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

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