| http://www.w3.org/ns/prov#value | - ows an example of a display produced on the display screen when information about rotation is used; [0029]FIG. 13 is a block diagram showing flows of signals and information when reference position information and the absolute position information are used; [0030]FIGS. 14 and 15 show examples of displays produced on the display screen when the reference position information and the absolute positi
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