IPC Subgroup
E21D 15/44 Hydraulic, pneumatic, or hydraulic-pneumatic props
Introduced: September 1968
Last revised: January 2006
Full Title
Props; Chocks > Telescopic props > Hydraulic, pneumatic, or hydraulic-pneumatic props
Classification Context
- Section:
- FIXED CONSTRUCTIONS
- Class:
- EARTH OR ROCK DRILLING; MINING
- Subclass:
- SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
Related Keywords
HYDRAULIC(S) mine-roof supports
1 direct subcode
Child Classifications
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- E21D 15/45 having closed fluid system, e.g. with built-in pumps or accumulators