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1997-10-31
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1990-04-17
Cutting head of a mechanical coal miner
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1999-02-01
Severed cutting head of a longwall mechanical coal miner
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1995-09-04
Flat cutting tool for a mechanical coal miner
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1993-10-04
Cutting head of a longwall joy miner
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1997-01-31
Mining head of a mechanical coal miner
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1991-02-11
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1993-11-02
Cutting head for longwall coal miners
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1995-02-06
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1997-01-31
Mining head a mechanical coal miner
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1999-07-05
Drive unit for cutting heads of longwall-type mechanical coal miners
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1993-11-15
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1997-10-31
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1992-04-06
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1998-01-30
Sledge of a mechanical coal miner for longwall use
ZA961154B
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1996-08-23
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1998-02-02
Arrangement of components of the coal miner's cutting head
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1994-05-16
Method of providing a coal miner cutting head with sutters and coal miner cutting head obtained thereby
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1995-10-30
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1995-08-21
Method of minining a longwall with a two-arm mechanical coal miner
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1987-04-21
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1990-03-05
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1997-08-18
Arm of a longwall coal miner
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1996-12-23
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1997-03-17
Mining head for a longwall mechanical coal miner and method of cutting coal by means of such mining head