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PL293500A2
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Method of taking away the longwall self-advancing roof supports from a working to be abandoned and apparatus therefor
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PL275980A1
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Reinforced four-piece set lining for galleries
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PL274687A1
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Horsehead suspension fastener
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PL271594A1
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Jet pump
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PL270045A1
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Circuit arrangement for rotary and transformer-type electric welding machines
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PL268740A1
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Spraying apparatus for washing of residues of expander
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PL257982A1
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Movable shield for shielding a workspace
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PL252732A1
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Method of making a body of coal minable by a coal planer
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PL252731A1
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Method of weakening a body of coal behind the longwall breast to be mined by a coal planer
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PL251947A1
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Method and apparatus for holding in place a longwall coveyor
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PL251897A1
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Method of reducing dustiness of air in preparatory workings and adjacent areas and apparatus therefor
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PL249999A2
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Regenerated modified universal joint of cardan type
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PL249537A1
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Method of removing idividual steel roof supports from a mined down longwall working
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PL249536A1
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Method of making a steel roof support resistant against harmful effects of mine water
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PL249084A1
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Longwall mechanical coal miner without dragging flexible connector but with double advancement drive
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PL247470A1
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Self-clamping lock for coupling together members of yeldable steel arching
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PL245865A1
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Method of protecting roof rocks
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PL245866A1
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Method of filling empty spaces and sealing mine workings
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PL241940A1
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Drawer of a longwall scraper conveyor
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PL240916A1
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Bipartite articulated sledge for a combined cutter loader
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