NF C48-331-2-7-1*NF EN 50131-2-7-1:2013 Alarm systems - Intrusion and hold-up systems - Part 2-7-1 : intrusion detectors -Glass break detectors (acoustic)
2013NF C48-331-2-7-1*NF EN 50131-2-7-1:2013 Alarm systems - Intrusion and hold-up systems - Part 2-7-1 : intrusion detectors -Glass break detectors (acoustic)