E21C 27/14

Machines which completely free the mineral from the seam by both slitting and breaking-down breaking-down effected by force or pressure applied to side of slit, e.g. by wedges

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data.epo.org/linked-data/def/cpc/E21C27-14

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Patent classification

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E21C 27/16

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Cooperative Patent Classification

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E21C 27/10

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