- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 5/04 - Lining shaftsLinings therefor with brick, concrete, stone, or similar building materials
Patent holdings for IPC class E21D 5/04
Total number of patents in this class: 30
10-year publication summary
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1
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1
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0
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4
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1
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3
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4
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3
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1
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