DIFF Subgroup
E21C 37/14 by compressed air; by gas blast; by gasifying liquids
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Other methods or devices for dislodging with or without loading > by making use of hydraulic or pneumatic pressure in a borehole > by compressed air; by gas blast; by gasifying liquids
CPC:
Other methods or devices for dislodging with or without loading (breaking-down by means inserted in slits E21C27/14) > by making use of hydraulic or pneumatic pressure in a borehole > by compressed air; by gas blast; by gasifying liquids
No child classifications to compare. This is a leaf node in both IPC and CPC.