| http://www.w3.org/ns/prov#value | - The display system 250 shown schematically in FIG. 10, is an example of such a larger display embodiment of the invention and is suitable for use in classrooms, lecture theaters, or other educational environments or in conference rooms, where it can be mounted to a wall, pursuant to optional features of the invention, for example by means of an overhead support rail 252 secured to a wall, from whi
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