| http://www.w3.org/ns/prov#value | - Therefore, in case that the user selectively executes one of two modes, a mode of copying on the rear surface of recording paper which has been already copied on its one surface or another mode of both-sides copying, it was necessary to confirm each time the sort of the recording paper accommodated in the paper feeding apparatus, i.e., whether both surfaces of the paper were blank or one surface o
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