| http://www.w3.org/ns/prov#value | - A common exemplary projection is known as an overhead projector which often is used during classes, lectures, presentations, and the like; overhead projectors often are used to project images of alphanumeric, graphical, or other information written or printed on the transparency, and provision, too, often is made to enable a lecturer, for example, to write directly on the transparency while used i
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