| Descriptors | Burglar alarms, Alarm systems, Warning devices, Anti-burglar measures, Security systems in buildings, Crime prevention devices, Buildings, Signal devices, Acoustic signals, Sound generators, Automatic telephone systems, Definitions, Dialling equipment (telephones), Telephone equipment, Installation, Containers, Circuits, Electrical connections, Control equipment, Performance, Electric power systems, Communication equipment, Digital signals, Sound intensity, Acoustic testing, Test equipment, Dimensions, Electrical installations |
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