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1987-08-10
Method of filling fissures in coal deposits
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1986-04-30
Process for improved flotation of coal and kerogen-containing oil
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1988-09-21
Method of mining & gasifying underground coal
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1988-05-26
Method of mining thick and steep coal deposits
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1988-05-26
Method of mining thick and steep coal deposits
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1985-11-27
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1989-06-29
Process for the gasification of coal and slams
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1986-11-18
Method of mining coal deposits and mechanical coal miner therefor
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1989-06-23
Method of mining thick disturbed mineral deposits
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1990-09-15
Method of mining ore deposits
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1985-12-17
Method of mining deposits
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1990-09-15
Method of open mining of mineral deposits
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1985-05-07
Method of mining coal residues from coal deposits
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1989-06-23
Method of mining mineral deposits
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1989-06-23
Method of mining mineral deposits
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1992-04-06
Method of mining coal in steep deposits
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1989-06-23
Method of mining steep coal seam
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1988-12-22
Method for underground mining of useful deposits
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1984-06-18
Method of mining thick deposits
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1988-06-23
Method for mining coal deposits having variable angles
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1991-03-25
Method for nderground mining of thick hard coal deposits wioth significant inclination
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1986-07-01
Cutter-loader for mining steep coal deposits
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1986-03-11
Method of mining sulfur deposits
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1986-02-11
Method of mining sulfur deposits
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1986-02-11
Method of mining sulfur deposits