by varying pulse repetition frequency

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Electric signal transmission systems > in which transmission is by pulses > by varying pulse repetition frequency

CPC:

Electric signal transmission systems (G08C17/00 takes precedence) > in which transmission is by pulses > by varying pulse repetition frequency

No child classifications to compare. This is a leaf node in both IPC and CPC.