| http://www.w3.org/ns/prov#value | - the two or more kinds or printing agents each having the different color; [0075] a residual amount measuring section to measure a residual amount of each of the two or more kinds of printing agents each having the different color existing in the printing section; [0076] a consumed amount comparing section to compare the residual amount of each of the two or more kinds of printing agents each havi
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