| 摘要 |
The passenger seats in large-capacity vehicles are provided with an electric signalling device in the form of a YES key and a NO key. The pulses released on actuation of these keys bring about a corresponding display in an electro-optical system and, with the aid of a pulse counter, allow the number of the YES/NO signals to be recognised clearly. The final values of the counters are correspondingly utilised by the service personnel.
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