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PL279002A2
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Apparatus for adjusting cutting level of a mining machine
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PL274421A1
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Expansion mix for sealing and filling rock mass crevices, fissures and voids in mines
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PL248153A1
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Underground assembly chamber for assembling mining equipment in particular self-advancing roof supports
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PL242314A1
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Method of recovering coal from post-flotation wastes
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PL242315A1
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Apparatus for removing froth from surface for radial settler
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PL241523A1
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Trough of longwall push-plate conveyor with an apparatus for cleaning the space under this trough
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PL241521A1
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Apparatus for cleaning of scrapers
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GB1380455A
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Method and apparatus for th' production of a coal and bitumen mixture
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