DIFF Subgroup
E21D 15/44 Hydraulic, pneumatic, or hydraulic-pneumatic props
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Props; Chocks > Telescopic props > Hydraulic, pneumatic, or hydraulic-pneumatic props
CPC:
Props (in the building art E04G25/00); Chocks > Telescopic props (general means for fixing telescopic parts together ) > Hydraulic, pneumatic, or hydraulic-pneumatic props
Of 2 combined children, 1 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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- E21D 15/45 having closed fluid system, e.g. with built-in pumps or accumulators IPC+CPC Available in IPC and CPC