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Metal, earth metal or alkali-earth metal using power storage method for wind power plants
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Lightweight construction wind motor
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Self-aligning, double wheeled wind power station
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Flexible drill rod feeding apparatus for quick rotary deep drilling
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Flexible bore rod feeding apparatus for quickening rotary deep drillings
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Apparatus for automatic stabilizing the drill loading of prospecting deep drillings
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Drilling rig of continuous operation
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