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PL289941A1
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Cutter for cutting conveyor belt flittings
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PL289284A1
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Method of enriching ores in particular copper ones
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PL289020A1
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Method of eliminating crump hazards in irregular rocky formations in the region of workings of underground ore mines
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PL286780A1
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Anchoring device
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PL281387A1
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Method for performing caving-in load
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PL281321A1
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Signalling unit for threshold convergence speed
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PL280866A1
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Method of carrying out repairs of railway tunnels and mobile equipment and resource base therefor
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PL280032A1
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Method of mining low thickness seams of useful minerals
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PL279617A1
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Method of protecting internal surfaces of a waste-heat boiler against corrosive and errosive effects
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PL279195A1
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Method of and apparatus for preparing cooper cathodes befor using them in a melting process
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PL279145A1
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Method of making yieldable safety pillars under circumstances of crump hazard
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PL278738A1
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The method of useful mineral beds exploitation
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PL278711A1
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Method of depositing flotation wastes in worked out areas of underground mines
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PL277891A1
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Method of recovering metals from copper ores
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PL277571A1
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Method of enriching ores in particular copper ones
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PL277353A1
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Method of mining vein-type ore deposits of small thickness
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PL276933A1
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Method for defining crump hazard in a mine sector
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PL275793A1
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A sensor for indicating the roof stratification in a mine heading
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PL275461A1
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Apparatus coupling a counter of acoustic emission phenomena with relevant rock mass
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PL275462A1
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Circuit arrangement of a counter for counting accoustic emission phenomena in rock mass after detonation of explosive charge therein
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