DIFF Main Group
E21F 9/00 Devices preventing sparking of machines or apparatus (preventing sparking of electric machines or apparatus H01K, H02K)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Devices preventing sparking of machines or apparatus
CPC: Devices preventing sparking of machines or apparatus (preventing sparking of electric machines or apparatus H01K, H02K)
Full Title
Full titles differ between systems:
IPC:
Devices preventing sparking of machines or apparatus
CPC:
Devices preventing sparking of machines or apparatus (preventing sparking of electric machines or apparatus H01K, H02K)
No child classifications to compare. This is a leaf node in both IPC and CPC.