DIFF Main Group
E21F 17/00 Methods or devices for use in mines or tunnels, not covered elsewhere (mine lighting F21, H05B)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Methods or devices for use in mines or tunnels, not covered elsewhere
CPC: Methods or devices for use in mines or tunnels, not covered elsewhere (mine lighting F21, H05B)
Full Title
Full titles differ between systems:
IPC:
Methods or devices for use in mines or tunnels, not covered elsewhere
CPC:
Methods or devices for use in mines or tunnels, not covered elsewhere (mine lighting F21, H05B)
IPC and CPC are identically structured here. All 5 subcodes exist in both systems.
4 shared codes have differing titles between IPC and CPC.
Child Classifications
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- E21F 17/02 Suspension devices for tubes or the like, e.g. for ventilating ducts (supporting pipes, cables or protective tubing in general F16L3/00 - F16L7/00) IPC+CPC Available in IPC and CPC
- E21F 17/16 Modification of mine passages or chambers for storage purposes, especially for liquids or gases (storing fluids in natural or artificial cavities or chambers in the earth B65G5/00) IPC+CPC Available in IPC and CPC
- E21F 17/18 Special adaptations of signalling or alarm devices (for mine lifts B66B; gas-sensitive devices per se G01N) +1 CPC IPC+CPC Available in IPC and CPC