CPC Subgroup
E21F 17/18 Special adaptations of signalling or alarm devices (for mine lifts B66B; gas-sensitive devices per se G01N)
Full Title
Methods or devices for use in mines or tunnels, not covered elsewhere (mine lighting F21, H05B) > Special adaptations of signalling or alarm devices (for mine lifts B66B; gas-sensitive devices per se G01N)
1 direct subcode
Child Classifications
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