DE3469179D1
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1988-03-10
Method and compositions for fracturing subterranean formations
DE3374936D1
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1988-01-28
Method and compositions for fracturing subterranean formations
ZA816000B
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1982-08-25
Continuous gallery construction,in particular for underground mine tunnels
GB8334290D0
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1984-02-01
Making boreholes in underground mine workings
PL247226A1
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1985-01-02
Underground mining planer
DE3460179D1
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1986-07-10
A method of excavating underground caverns in rock
PL242360A1
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1984-12-17
Method of protecting underground dog headings in particular longwall extraction galleries
BG46008A3
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1989-09-15
Method and installation for drilling openings in soft rocks in mines
PL250634A1
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1985-07-30
Apparatus for placing units of self-advancing hydraulic roof supports in underground mine workings in particular longwall workings
PL245257A2
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1984-10-22
Method of protection of mine dog headings and tunnels
PL256238A1
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1988-04-14
Method of sealing mine workings in particular dog headings
GB2172919B
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1988-06-08
Shearer drum for a drum shearer-loader used in underground mining
PL237807A2
(en )
1983-06-20
Method of preventing crumps in underground mines
PL248056A2
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1985-04-09
Method of filling mined out workings in mines
PL253270A1
(en )
1986-11-18
Method of detecting crump hazard conditions in underground mine workings
PL247539A1
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1985-12-17
Method of mining coal in a longwall system
PL252355A1
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1985-12-03
Underground coal mining method
PL249715A2
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1985-07-30
Method of and apparatus for filling underground mine workings
PL237772A1
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1984-02-13
Method of filling boreholes opening in underground workings
PL266955A1
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1989-01-23
Method of mining rocky massives in mine workings
GB2141159B
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1986-09-17
Device for connecting adjacent segments of tunnel-wall support arches in underground tunnels
PL136058B2
(en )
1986-01-31
Method of reducing a risk of crumps in underground mines
PL264328A1
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1988-10-27
Method for reducing water danger in vertical mine galleries
PL240257A1
(en )
1984-07-30
Method of protecting galleries and workings
PL252066A1
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1986-08-26
Apparatus for mining rocky formations in a mine shaft