{HEAD ~ The apparatus} includes {TAIL ~ a 50% transmission/50% reflection mirror}, a vidicon for scanning the original and its copy through the mirror, means for reading out the vidicon images of the original and the copy, and means for comaring and analyzing the copy and the original for generating a comparison signal 
{ HEAD ~ The apparatus } includes { TAIL ~ a 50 % transmission/50 % reflection mirror } , a vidicon for scanning the original and its copy through the mirror , means for reading out the vidicon images of the original and the copy , and means for comaring and analyzing the copy and the original for generating a comparison signal
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