A simulator is regarded as a teaching or training device proper to this sub-class if the simulator gives perceptible sensations having a likeness to the sensations the student would experience in reality in response to actions taken by him. Simulators which demonstrate by means involving computing, the functioning of apparatus or of a system are classified in class Fulltext... Hierarchy... Expanded...G06 if no provision exists elsewhere. Simulator components which are identical with real devices or machines or components thereof are classified in the relevant sub-classes for these devices or machines and not in sub-class Fulltext... Hierarchy... Expanded...G09B.
Models of buildings, installations, or the like are covered by this sub-class.
The term "sign" is used in this sub-class to designate a mark or indication serving to make something recognisable, the information presented being non-varying, even if it is flashing; by way of example it covers, therefore, advertising hoardings, or luminous safety arrangements such as rear reflectors. [3]
In contrast to sub-class Fulltext... Hierarchy... Expanded...H04N in which are classified display devices capable of representing continuous brightness value scales, the present sub-class is limited to devices using only a discrete number of brightness values, e.g. visible/non-visible. [3]
The visual effect may be produced by a luminescent screen scanned by an electron beam, directly by controlled light sources, by projection of light, from controlled light sources onto characters, symbols, or elements thereof drawn on a support, or by electric, magnetic, or acoustic control of the parameters of light rays from an independent source. [3]