Patent classifications
E
FIXED CONSTRUCTIONS
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E21
EARTH OR ROCK DRILLING; MINING
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E21C
MINING OR QUARRYING
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27/00
Machines which completely free the mineral from the seam
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E21C27/10
by both slitting and breaking-down
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E21C27/12
breaking-down effected by acting on the vertical face of the mineral, e.g. by percussive tools
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