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  • E21C37/00
    		•  Other methods or devices for dislodging with or without loading (breaking-down by means inserted in slits E21C 27/14) HB CC 2D065
  • E21C37/00@A
    		•  using of static crushing or expanding materials, or related to thereof HB CC 2D065
  • E21C37/00@Z
    		•  Others HB CC 2D065
  • E21C37/02
    		•  .by wedges HB CC 2D065
  • E21C37/04
    		•  .by devices with parts pressed mechanically against the wall of a borehole HB CC 2D065
  • E21C37/06
    		•  .by making use of hydraulic or pneumatic pressure in a borehole HB CC 2D065
  • E21C37/08
    		•  ..Devices with pistons, plungers, or the like pressed locally against the wall of the borehole HB CC 2D065
  • E21C37/10
    		•  ..Devices with expanding elastic casings HB CC 2D065
  • E21C37/12
    		•  ..by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid (slitting by jets of water E21C 25/60; blasting by explosives F42D) HB CC 2D065
  • E21C37/14
    		•  ..by compressed air; by gas blast; by gasifying liquids HB CC 2D065
  • E21C37/16
    		•  .by fire-setting or by similar methods based on a heat effect (drilling by use of heat E21B 7/14) HB CC 2D065
  • E21C37/18
    		•  .by electricity HB CC 2D065
  • E21C37/20
    		•  .by ultrasonics HB CC 2D065
  • E21C37/22
    		•  .Hand tools or hand-held power-operated tools specially adapted for dislodging minerals (slitting machines guided solely by hand E21C 25/64) HB CC 2D065
  • E21C37/24
    		•  ..Pick hammers (pneumatic hammers in general B25D; percussion drilling E21B 1/00) HB CC 2D065
  • E21C37/26
    		•  .Chisels or other cutting tools not mentioned before HB CC 2D065
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