Enhanced safety by means of clear information on hazards and operational disturbances by a plain language communication device

A plain language communication device is presented. It offers a means of automatic paging of events reported electrically by any number of monitoring stations by providing comprehensive and clear information on events to persons directly concerned with operation procedures. It consists of a sound-tape cassette with the spoken message to be put through. Duration and content of the message are freely selectable. The spoken text can be selected via a logic allocation system, called off and then be paged over any distance at any number of outstations (e.g., loudspeaker or telephone). In case of power breakdowns the device is capable of bridging critical situations by spoken information using a buffer storage battery. Test results in underground operations are successful.