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