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坑内掘り こうないぼり kounaibori

JMdict entry #2535680

  1. noun (common) (futsuumeishi) underground mining
    see: 露天掘り

Kanji in this word

坑
pit, hole
内
inside, within, between
掘
dig, delve, excavate

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坑内掘り炭鉱