CPC Subgroup
E21D 1/03 mechanically, (E21D1/08 takes precedence)
Full Title
Sinking shafts > mechanically, (E21D1/08 takes precedence)
2 direct subcodes
Child Classifications
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E21D 1/03 Sinking shafts > mechanically, (E21D1/08 takes precedence)
2 direct subcodes
Navigate with arrow keys, Enter to open