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PL280910A1
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Benches for mine battery loading onto battery locomotives
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PL279447A1
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Air stopping
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PL278062A1
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Method of examining a rock mass where tremor hazard is being present
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PL278230A1
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Water pressure and consumption control system for mine water supply pipelines
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PL276713A1
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System of excavation and devices for removal of sediments from the mine decanters
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PL275270A1
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Method of and arrangement of workings for filling dip-headings
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PL275269A1
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Apparatus for scraping off dirt from conveyor belt surface
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PL274238A1
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Method of and arrangement of workings for clarification of filling material carrying water
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PL273174A1
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Method of purifying hydraulic filling drain water and apparatus therefor
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PL269795A1
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Seismic pick-up mount to be anchored in rock mass
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PL269033A1
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Conveyor belt retarding apparatus
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PL268908A1
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Apparatus for retarding sloped conveyor belt
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PL256614A1
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Braking device for a belt conveyor
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PL255406A1
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Drill pipe string with bolted together drill pipes and aqueous drilling fluid
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PL254463A1
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Method and apparatus for preparing aqueous suspension of volatile ashes
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PL252413A1
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Method of protecting miners in crump endangered workings
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PL251904A1
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System for protecting mining machines
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PL251879A2
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Apparatus for protecting a mining machine against slipping down under its own gravity
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DE3442425A1
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Device for securing a rock-excavating machine used in mining
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PL250423A1
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Method of driving a mine shaft beneath its bottom stopper
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