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1996-09-06
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2000-10-04
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1999-07-28
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1999-03-10
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ZA956595B
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1996-05-16
Roof support for underground excavations
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1993-12-27
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1998-02-04
Excavation apparatus
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1995-03-30
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HUT61381A
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1992-12-28
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1996-06-12
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1998-10-08
Winning apparatus for underground ore mining operations
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1995-07-27
Rock support apparatus for underground excavations
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2000-03-14
Apparatus for prestressing a support in underground mining
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1993-08-25
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1995-07-24
Underground mining planer
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1998-09-03
Underground mine support
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1996-10-22
Underground surveying device
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1993-07-07
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1996-06-10
Method of an apparatus for mining underground
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1998-05-29
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1996-01-22
Method of locally demethanising the low-methane underground mine workings
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1993-01-27
Survey method for underground excavations
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1998-02-23
Rock drilling apparatus.
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1997-08-13
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2000-12-28
Apparatus for timbering