Device 1, comprising in {HEAD ~ addition} 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 {TAIL ~ these indications} and means for displaying the latter at the same time as the corresponding numbers called 
Device 1 , comprising in { HEAD ~ addition } 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 { TAIL ~ these indications } and means for displaying the latter at the same time as the corresponding numbers called
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