There was a pause, then the man’s voice said, ‘Merci.’
He hung up, and the woman did the same.
Lebel stared at the slowly turning tape spool.
‘You know the number she rang?’ Lebel asked the engineer.
‘Yup. We can work it out from the length of the delay while the dialing disc spins back to zero. The number was MOLITOR 5901.'
-Frederick Forsyth, The Day of the Jackal
Sometimes I forgot that this is a 1971 novel and the story took place in 1963.
Gosh... our KMRT could actually be a telematics expert in those days.
Nonetheless, a very, very good novel :)