DIFF Main Group
H04M 13/00 Party-line systems (substation equipment H04M1/00; exchange equipment H04M3/00, H04M5/00; metering arrangements H04M15/36)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Party-line systems
CPC: Party-line systems (substation equipment H04M1/00; exchange equipment H04M3/00, H04M5/00; metering arrangements H04M15/36)
Full Title
Full titles differ between systems:
IPC:
Party-line systems
CPC:
Party-line systems (substation equipment H04M1/00; exchange equipment H04M3/00, H04M5/00; metering arrangements H04M15/36)
No child classifications to compare. This is a leaf node in both IPC and CPC.