60839-5-4-1991 Alarm systems - Part 5: Requirements for alarm transmission systems - Section 4: Alarm transmission systems using dedicated alarm transmission paths (Edition 1.0)
Systèmes d?alarme - Partie 5: Prescriptions pour les systèmes de transmission d?alarme - Section 4: Systèmes de transmission d?alarme utilisant des voies de transmission d?alarme spécialisées (Edition 1.0)
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