DIFF Subgroup
H04M 19/08 with current supply sources at the substations (generating ringing current H04M19/04)
Introduced: September 1968
Title
Titles differ between systems:
IPC: with current supply sources at the substations
CPC: with current supply sources at the substations (generating ringing current H04M19/04)
Full Title
Full titles differ between systems:
IPC:
Current supply arrangements for telephone systems > with current supply sources at the substations
CPC:
Current supply arrangements for telephone systems (for selecting-equipment H04Q1/28) > with current supply sources at the substations (generating ringing current H04M19/04)
No child classifications to compare. This is a leaf node in both IPC and CPC.