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1986-12-17
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1987-07-13
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1987-04-21
Method of ventilating mine workings and apparatus therefor
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1987-07-27
Method of testing coal miner brake for correct operation and apparatus therefor
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Method of and apparatus for protecting work area and exit of longwall workings
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Method of filling and sealing workings in mines and apparatus therefor
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A method of rock bolting,and a device,and a roof bolting apparatus