- All sections
- E - Fixed constructions
- E21C - Mining or quarrying
- E21C 41/18 - Methods of underground miningLayouts therefor for brown or hard coal
Patent holdings for IPC class E21C 41/18
Total number of patents in this class: 174
10-year publication summary
|
6
|
11
|
13
|
28
|
20
|
10
|
17
|
16
|
15
|
1
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| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |