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NBN 837 : 1971
NBN 911 : 1972
NBN A 25 102 : 1976 TUBES EN ACIER SANS SOUDURE POUR COLLECTEURS DE CHAUDIERES POUR TUYAUTERIES INTERNES ET DE LIAISON DE CHAUDIERES ET D'APPAREILS SOUMIS A PRESSION - NUANCES ET QUALITES
NBN D 01 001 : 1978 CENTRAL HEATING, VENTILATION AND AIR CONDITIONING - PARTICULAR REQUIREMENTS FOR HIGH PRESSURE INSTALLATIONS (WITH HOT WATER OR STEAM)
NBN 731 : 70 AMD 4 89 CALCULATION OF BOILER PARTS - GENERAL PRINCIPLES

NBN 731 : 70 AMD 4 89 CALCULATION OF BOILER PARTS - GENERAL PRINCIPLES
NBN 738 : 70 ADD 4 89 CALCULATION OF BOILER PARTS - UNANCHORED BOTTOMS OF CYLINDRICAL BOILER SHELLS SUBJECTED TO INTERNAL PRESSURE
NBN 737 : 70 ADD 1 86 BEREKENING VAN DE KETELELEMENTEN - VERSTERKING VAN DE OPENINGEN IN CILINDRISCHE ROMPEN ONDER INWENDIGE DRUK

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