| 摘要 |
A disabled persons aid system by means of which a disabled person can request assistance. So that the disabled person can very easily attract the attention of persons from whom he requires assistance, the system includes a plurality of infra-red transmitter devices for use by disabled persons and a plurality of receivers each of which can be operated by any one of the transmitter devices, the receivers being located, in view of the public on the premises of shops, petrol stations, offices and public buildings. |
