| http://www.w3.org/ns/prov#value | - The structure of the projection system is not limited to the upside-down structure of the projection system 10 in the first embodiment, but may be a structure rotated through 90 degrees The screens in the respective embodiments are not limited to those used in combination with a particular projection engine unit to constitute a projection system, but may be used with any types of projector.
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