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