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Latest Developments With Ventilation Techniques, Water Spray Systems and Gas Emission Judging Methods in Machine-Driven Headings.
Westfalische Berggewerkschaftskasse, FRG; Landesoberbegant Nordrhein-Westfalen, FRG
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Marth, W.
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Safety Requirements for Conveyor Belts in German Underground Coal Mines.
Landesoberbergamt Nordrhein-Westfalen, Dortmund, Federal Republic of Germany
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