Normadoc

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91 : Construction materials and building (1)

77 : Metallurgy (1)

77.140 : Iron and steel products (1)

91.060 : Elements of buildings (1)

91.060.40 : Chimneys, shafts, ducts (1)

77.140.50 : Flat steel products and semi-products (1)

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77.140.50 : Flat steel products and semi-products