- All sections
- E - Fixed constructions
- E21D - Shafts; tunnels; galleries; large underground chambers
- E21D 15/51 - Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
Patent holdings for IPC class E21D 15/51
Total number of patents in this class: 19
10-year publication summary
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