| http://www.w3.org/ns/prov#value | - Thus, in the multi-direction image system using the projectors 2, there are important technical problems such that a screen having a maximal horizontal length A is implemented in an image case 3 having a minimal space, to the contrary, the same size screen is implemented in the minimal sized image case 3, and/or images are displayed in two directions, i.e. in the right and left directions of the i
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