Patent US 4,636,848

There is disclosed a document information filing system which displays the title information and the picture information by means of single display device comprised of a cathode-ray tube. A two-dimensional scanning device is provided for optically scanning a document to be filed to produce picture information corresponding to the document. The picture information produced by the scanner is magnetically recorded on a magnetic tape of an information custody device together with a retrieval information corresponding to the picture information and comprised of a plurality of code groups. When a proper code constituting the retrieval information is set by a keyboard, the title information including this code is selected from the information custody device. On the basis of the title information, desired document picture information is retrieved and extracted. The retrieval code of the title information and the desired document picture information are selectively transmitted to a cathode-ray display by way of a gate circuit.