A method and apparatus for presenting an information signal such as an image signal or a sound signal using a plurality of signal sources. It is a mechanical gear apparatus comprising a support base, a drive gear, and, a directional gear assembly comprising three gears and, another configuration in which there is a mechanical gear apparatus comprising a support base, a driven gear, and a directional gear assembly comprising two directional gears and a drive gear. In the graph representation, a vertex can represent an entity or an entity instance, and an edge can represent a relationship or a relationship instance. The first distribution controller can transmit a standardized description of the identified orphan network section to a second distribution controller connected to the second process devices.