DIFF Subgroup
H04B 3/54 Systems for transmission via power distribution lines
Introduced: September 1968
Title
Titles differ between systems:
IPC: Systems for transmission power distribution lines
CPC: Systems for transmission via power distribution lines
Full Title
Full titles differ between systems:
IPC:
Line transmission systems > Systems for transmission power distribution lines
CPC:
Line transmission systems (combined with near-field transmission systems H04B5/00) > Systems for transmission via power distribution lines
CPC subdivides this area 3x more granularly than IPC with 4 additional codes.
4 codes are CPC-only extensions.
Child Classifications
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- H04B 3/56 Circuits for coupling, blocking, or by-passing of signals IPC+CPC Available in IPC and CPC