DIFF Subgroup
E21C 37/20 by ultrasonic waves
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Other methods or devices for dislodging with or without loading > by ultrasonic waves
CPC:
Other methods or devices for dislodging with or without loading (breaking-down by means inserted in slits E21C27/14) > by ultrasonic waves
No child classifications to compare. This is a leaf node in both IPC and CPC.