- All sections
- E - Fixed constructions
- E21C - Mining or quarrying
- E21C 41/28 - Methods of surface miningLayouts therefor for brown or hard coal
Patent holdings for IPC class E21C 41/28
Total number of patents in this class: 21
10-year publication summary
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1
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0
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1
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2
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2
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1
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2
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0
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0
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1
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