- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 5/11 - Lining shaftsLinings therefor with combinations of different materials, e.g. wood, metal, concrete
Patent holdings for IPC class E21D 5/11
Total number of patents in this class: 13
10-year publication summary
|
0
|
1
|
1
|
5
|
1
|
1
|
1
|
0
|
1
|
0
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |