This class includes investigation and surveillance activities, guard and other protective activities for individuals and property. This involves the checking of individuals' backgrounds, tracing of missing persons, investigation of thefts and embezzlements and also patrol or other activities with primarily hired personnel to directly protect individuals or property, e.g. transport of valuables, or other means of protection with the same purpose such as guard dogs, armoured cars, etc. Also included are bodyguard activities, street patrol, guard and watchman activities for apartment buildings, offices, factories, construction sites, hotels, theatres, dance halls, etc., and store detective activities and activities such as monitoring mechanical or electrical protective devices, consultancy in the field of industrial security, finger-printing, signature and handwriting identification, etc.

Exclusions: Installation of alarm systems is classified in class 4530 (Building installation).

Investigation in connection with insurance is classified in class 6720 (Activities auxiliary to insurance and pension funding).