DIFF Subgroup
H04B 3/40 Artificial lines; Networks simulating a line of certain length
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Line transmission systems > Details > Artificial lines; Networks simulating a line of certain length
CPC:
Line transmission systems (combined with near-field transmission systems H04B5/00) > Details > Artificial lines; Networks simulating a line of certain length
No child classifications to compare. This is a leaf node in both IPC and CPC.