{HEAD ~ Device} 1, comprising in addition {TAIL ~ clock means} to indicate the moments of the starts and ends of the successive calls, said moments being defined by the date, the hour and the minute concerned, means for recording these indications and means for displaying the latter at the same time as the corresponding numbers called 
comprising
{ HEAD ~ Device } 1 , comprising in addition { TAIL ~ clock means } to indicate the moments of the starts and ends of the successive calls , said moments being defined by the date , the hour and the minute concerned , means for recording these indications and means for displaying the latter at the same time as the corresponding numbers called
HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH