It is an important factor of efficient research to select and utilize necessary information from rapidly increasing technical information and experimentation data. This being recognized, not a few enterprizes wish to have a computerized information processing system. But when we think of their knowledge about the computer and its users' feeling toward documentation management, immediate outset of such a system seems not advisable. On such a stage, it may be wise to adopt a card system which can be retrieved mechanically. Based on his experiences the author describes a mechanically retrieved card system of technical data processing, the processing method, and shifting of it to E.D.P.S.
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