Bullet Ping Pong Gates

Patent number: 200902

Imagine you are blind. Life is pretty difficult then. But sometimes things are made even more difficult. For example at the entrance gates to train or metro. These gates play a beep when you hold your chip card at the gate. For the seeing, there is a small screen that shows your last transaction too. The blind just hear tens of beeps, not knowing whether it is yours or your neighbour's.

That's why the blind get a "pong" card. Among all the people who hear "ping"you will hear "pong". That way you know your blind transaction succeeded.

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