Oa General works
Ob (Waste)water
Oc Electric installations
Od Gas installation
Oe Heating
Of Air conditioning
Og Cooling plants
Oh Dust collection system
Oi Sanitary facilities
Ok Waste disposal
Om Lifts. Escalators
On Protection of buildings
Op Illumination and lighting engineering
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Elements in focus are visually enhanced by an black underlay, while the font is whitened
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