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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E21C27/20
Mineral freed by means not involving slitting
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E21C27/32
by adjustable or non-adjustable planing means with or without loading arrangements
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E21C27/36
Machine self-propelled along the working face
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