| http://www.w3.org/ns/prov#value | - It should also be noted that the scanning unit of FIG. 20 has a large depth of field, and together with a convex screen shape, it is possible to project sufficiently, focused information on this screen over a wide angle from a short distance behind the screen, from a position toward the center of the arc of the screen, often without the need for mirrors and other elements.
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