PL317871A1
(en )
1997-04-28
Apparatus for and method of continually mining coal
PL329210A1
(en )
1999-04-26
Method of performing chemically induced stimulation of underground coal beds by means of gaseous oxidants
PL321084A1
(en )
1998-01-19
Method of performining mining work in tectonically hazarded sedimentary deposits in particular of coal
PL322095A1
(en )
1998-03-02
Method of getting coal in mines characterised by difficult geological conditions
PL318728A1
(en )
1998-08-31
Method of mining underground ore deposits
PL303891A1
(en )
1995-12-27
Longwalll coal mining method
PL322788A1
(en )
1999-04-26
Method of mining thick coal beds
PL318226A1
(en )
1998-08-03
Method of mining steeply inclined thick coal deposits
PL321098A1
(en )
1999-01-18
Method of mining coal beds
PL303854A1
(en )
1995-12-27
Method of mining coal within existing workings of disturbed stability
PL300604A1
(en )
1995-04-18
Method of improving coal mining effectiveness
PL295559A2
(en )
1993-05-17
Method of cavityless longwall coal mining
PL316086A1
(en )
1996-12-23
Longwall coal miner
PL314517A1
(en )
1996-12-09
Method of and apparatus for mining minerals especially coal
PL304260A1
(en )
1996-01-22
Method of locally demethanising the low-methane underground mine workings
PL292685A1
(en )
1993-06-14
Method of mining useful minerals through bore-holes
PL306749A1
(en )
1995-06-12
Method of carrying on mining work in underground mines within areas featured by extremely difficult geological and mining conditions
PL331966A1
(en )
2000-09-25
Method of mining mineral deposits
PL335175A1
(en )
2001-03-12
Underground mining method useful in getting solid mineral deposits
PL301769A1
(en )
1995-07-10
Bore-hole sulphur mining method
PL319618A1
(en )
1998-10-26
Method of dewatering deep underground mines
PL309433A1
(en )
1997-01-06
Method of mining strongly inclined or steep coal deposits
ZA97743B
(en )
1997-07-31
Method of mining underground.
PL288001A1
(en )
1991-06-03
Method of mining useful minerals
PL317845A1
(en )
1997-07-21
Mining conveyor for an underground coal mine