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In studies of the mechanical processing of natural languages, it is important to precisely investigate and analyze the language phenomena from the standpoint of technical engineering and to make the arrangement of information effective for processing. In accordance with such recognition, the authors report the results of investigations of approximately 10000 Japanese technical papers concerning the parallel structure as one of the obstacles in natural language processing. All of the parallel structures appearing in about 3500 spots were fully abstracted and classified into the parallel structures of 3 kinds: sentence format, noun phrase and the others. Thus, the types of the parallel structures and the frequency of appearance were revealed.