Without them, Paris would’ve stood still. They were immortalised in song by Serge Gainsbourg, and put into poetry by the cheeky Raymond Queneau. But by 1975, Paris’ metro ticket punchers, or poinçonneurs, were a dying breed. Their rise and fall traces the streamlining of the whole métropolitan system, which was inaugurated at the 1900 Paris World’s Fair to a crowd in…