NF S61-952:1977 COMPONENTS OF AUTOMATIC FIRE DETECTION SYSTEMS. PART FIVE : HEAT-SENSITIVE DETECTORS. POINT DETECTORS CONTAINING A STATIC ELEMENT. (EUROPEAN STANDARD EN 54-5).
1977NF S61-952:1977 COMPONENTS OF AUTOMATIC FIRE DETECTION SYSTEMS. PART FIVE : HEAT-SENSITIVE DETECTORS. POINT DETECTORS CONTAINING A STATIC ELEMENT. (EUROPEAN STANDARD EN 54-5).