| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS [0018] The above and other objects and advantages of the present invention will become more apparent by describing in detail preferred embodiments thereof with reference to the accompanying drawings, wherein: [0019]FIG. 1 is a block diagram showing a principal configuration for manually switching a display screen of a screen display device; [0020]FIG. 2 is a block
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