Design modification is inevitable in the developing process of new digital systems and when it occurs it requires some rework on the produced digital system. Most modifications are concentrated on multilayer printed-circuit boards (PCB's). It is not only difficult to rework the multilayer PCB, but also very cumbersome to prepare engineering change documents. A technique for automatic preparation of engineering change data of the PCB is described.
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Honda et al. (1974) studied this question.
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