- All sections
- E - Fixed constructions
- E21D - Shafts; tunnels; galleries; large underground chambers
- E21D 9/087 - Making by using a driving shield with additional boring or cutting means with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines
Patent holdings for IPC class E21D 9/087
Total number of patents in this class: 71
10-year publication summary
|
4
|
1
|
4
|
4
|
6
|
8
|
10
|
4
|
9
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |