- All sections
- E - Fixed constructions
- E21F - Safety devices, transport, filling-up, rescue, ventilation, or drainage in or of mines or tunnels
- E21F 16/02 - Drainage of tunnels
Patent holdings for IPC class E21F 16/02
Total number of patents in this class: 56
10-year publication summary
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2
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1
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3
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2
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1
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5
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5
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2
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6
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3
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| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |