DIFF Subgroup
H04B 7/145 Passive relay systems
Introduced: July 1974
Full Title
Full titles differ between systems:
IPC:
Radio transmission systems, i.e. using radiation field > Relay systems > Passive relay systems
CPC:
Radio transmission systems, i.e. using radiation field (H04B10/00, H04B15/00 take precedence) > Relay systems > Passive relay systems
No child classifications to compare. This is a leaf node in both IPC and CPC.