The objects of the present invention are achieved by utilizing {HEAD ~ a vidicon} and {TAIL ~ a partially reflecting partially transmitting mirror} positioned so as to permit the simultaneous viewing of the original document and the reproduced document 
The objects of the present invention are achieved by utilizing { HEAD ~ a vidicon } and { TAIL ~ a partially reflecting partially transmitting mirror } positioned so as to permit the simultaneous viewing of the original document and the reproduced document
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