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PCE
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DIFF Subgroup
E21C 27/20

Mineral freed by means not involving slitting

Introduced: September 1968

Full Title

Machines which completely free the mineral from the seam > Mineral freed by means not involving slitting

IPC and CPC are identically structured here. All 7 subcodes exist in both systems.

2 shared codes have differing titles between IPC and CPC.

Child Classifications

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  • E21C 27/22 by rotary drills with breaking-down means, e.g. wedge-shaped drills IPC+CPC Available in IPC and CPC
  • E21C 27/24 by milling means acting on the full working face IPC+CPC Available in IPC and CPC
  • E21C 27/26 by closely adjacent cutter chains acting on the full working face IPC+CPC Available in IPC and CPC
  • E21C 27/28 by percussive drills with breaking-down means, e.g. wedge-shaped tools IPC+CPC Available in IPC and CPC
  • E21C 27/30 by jaws, buckets or scoops that scoop-out the mineral IPC+CPC Available in IPC and CPC
  • E21C 27/46 by percussed planing means IPC+CPC Available in IPC and CPC