DIFF Subgroup
E21F 17/12 Dam doors
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Methods or devices for use in mines or tunnels, not covered elsewhere > Dams, e.g. for ventilation > Dam doors
CPC:
Methods or devices for use in mines or tunnels, not covered elsewhere (mine lighting F21, H05B) > Dams, e.g. for ventilation > Dam doors
No child classifications to compare. This is a leaf node in both IPC and CPC.