GB128455A
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Improvements in Tool Retaining Devices for Percussive Rock Drills and like Fluid Pressure Operated Machines.
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GB120533A
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Improvements in Valve Apparatus for Rock Drills and the like Fluid Pressure Operated Tools.
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GB115605A
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Improvements in Valve Apparatus for Rock Drills and the like Fluid Pressure Operated Tools.
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GB116660A
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Improvements in Valve Apparatus for Rock Drills and the like Fluid Pressure Operated Tools.
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GB113246A
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Improvements in Valve Apparatus for Rock Drills and the like Fluid Pressure Operated Tools.
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GB110731A
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Improvements in Percussive Rock Drills and like Fluid Pressure Operated Tools.
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GB109777A
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Improvements in Percussive Rock Drills and like Fluid Pressure Operated Tools.
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GB106451A
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Improvements in Percussive Rock Drills and like Fluid Pressure Operated Tools.
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GB100524A
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Improvements in Valves and Valve Gear for Rock Drills.
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GB191504004A
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Improvements in Valves and Valve Gear for Percussive Rock Drills, Tools and the like.
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GB191406580A
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Improvements in Valves and Valve Gear for Rock Drills.
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