For example , the UK and Sweden adopted systems of shuttered panels ( in contradiction to the Chappe brothers ' contention that angled rods are more visible ) .
Many national services adopted signaling systems different from the Chappe system .
The UK and Sweden adopted systems of shuttered panels ( in contradiction to the Chappe brothers ' contention that angled rods are more visible ) .
Many national services adopted signaling systems different from the Chappe system .