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PCE
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DIFF Subgroup
E21C 27/28

by percussive drills with breaking-down means, e.g. wedge-shaped tools

Introduced: September 1968

Full Title

Machines which completely free the mineral from the seam > Mineral freed by means not involving slitting > by percussive drills with breaking-down means, e.g. wedge-shaped tools

No child classifications to compare. This is a leaf node in both IPC and CPC.