19.040 Environmental testing
25.220.20 Surface treatment
49.025.01 Materials for aerospace construction in general
49.025.05 Ferrous alloys in general
49.025.10 Steels
49.025.15 Non-ferrous alloys in general
49.025.40 Rubber and plastics
49.025.99 Other materials
49.030.30 Nuts
49.060 Aerospace electric equipment and systems