The telephone set 2 wherein said self regulation means comprises {HEAD ~ means} for controlling {TAIL ~ the degree} of attenuation of the first attenuator of the respective channel 
for controlling
The telephone set 2 wherein said self regulation means comprises { HEAD ~ means } for controlling { TAIL ~ the degree } of attenuation of the first attenuator of the respective channel
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH