DIFF Subgroup
H04B 7/14 Relay systems
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Radio transmission systems, i.e. using radiation field > Relay systems
CPC:
Radio transmission systems, i.e. using radiation field (H04B10/00, H04B15/00 take precedence) > Relay systems
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
IPC defines codes here since 1974.
Child Classifications
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