| 摘要 |
<p>The present invention pertains to a remote signalling apparatus particularly suitable for remote surveillance purposes and provides direct signalling of occurred events via the actuation of optical and acoustic alarm reporting devices, and further provides for retransmission signalling of occurred events via the use of remote signalling systems of the radio-electronic transmission type and/or the telephonic transmission type. Apparatus is provided to detect and indicate the occurrence of a malfunction of a transmitter or receiver unit, while further providing irrefutable proof of occurred events by recording the occurrence of the same along with the date and time of such occurrence.</p> |
