| http://www.w3.org/ns/prov#value | - The invention is also particularly useful in a control system for a lighting system where the illumination level of an area maintained by the control system must be easily adjustable.BRIEF DESCRIPTION OF THE DRAWINGSTo enhance the understanding of the following detailed description of the preferred embodiments, reference can be made to the accompanying drawings, in which:FIG. 1 is a side elevation
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