- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 9/08 - Making by using a driving shield with additional boring or cutting means
Patent holdings for IPC class E21D 9/08
Total number of patents in this class: 92
10-year publication summary
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3
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4
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12
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5
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3
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10
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6
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6
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6
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0
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