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1987-09-07
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1988-07-06
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1987-02-25
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1989-11-22
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1989-04-17
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1989-11-14
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1986-12-17
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1988-11-30
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1990-01-22
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1990-06-15
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1987-07-27
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1985-07-30
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1989-01-23
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1987-12-30
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1989-12-28
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1987-04-21
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1984-07-30
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1986-12-02
Method of lining of longwalls and section of self-advancing supports for longwalls
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1986-07-15
Method of and apparatus for mining filled longwalls
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1985-12-17
Method of carrying out sealing operation on mine tubbing and apparatus therefor
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1991-07-31
Method for sealing mine workings
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1988-12-01
Method and installation for mining
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1983-12-19
Apparatus for determination of cross-section of mine heading and tunnels
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1984-08-13
Method of providing false timbering for longwall cross-cuts
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1990-04-17
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