- All sections
- E - Fixed constructions
- E21D - Shafts; tunnels; galleries; large underground chambers
- E21D 23/26 - Hydraulic or pneumatic control
Patent holdings for IPC class E21D 23/26
Total number of patents in this class: 30
10-year publication summary
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2
|
0
|
1
|
1
|
5
|
2
|
3
|
0
|
5
|
0
|
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