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PL276136A1
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Method of and apparatus for laying filler pipelines in mines
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PL276102A1
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Fitter's telephone set
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PL250359A1
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Mine conveyor
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PL250371A1
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Reversible drive unit
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PL249698A1
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Method of mending damaged sheat of flexible ventilation ducts in mines
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PL246365A1
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Agent for sealing rocky mass and preventing occurence of endogenous fires
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PL245620A1
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Gas sampling probe
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PL244047A1
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Hydraulic head block in particular for mining cars
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PL242433A1
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Method of early detection of spontaneous fires occuring in deposits of mineral raw-materials,especially of coal
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PL242434A1
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Assembling stand for self-advancing roof supports
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PL241364A1
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Braking device of monorail
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PL237559A1
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Apparatus for coiling a rope over a windlass drum
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PL236000A1
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Method of mining of thick coal beds using hydraulic filling
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PL233337A1
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Apparatus protecting pressure gauges against fouling,especially in water pipelines
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PL232358A1
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Shielding barrier for protecting gears against becoming dirty
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