| http://www.w3.org/ns/prov#value | - nting agents each having the different color; [0050] 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; [0051] a consumed amount comparing section to compare the residual amount of each of the two or more kinds of printing agents each having the different color with t
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