IC 011. US 013 021 023 031 034. G & S: Ventilators; and smoke extractors
IC 037. US 100 103 106. G & S: installation, repair and maintenance of fire alarm installations, air conditioning installations, fire extinguishing installations, ventilation installations and smoke removal installations
IC 042. US 100 101. G & S: Design of fire alarm, smoke extraction, fire extinguishing and air conditioning installations
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