| 摘要 |
A multilayer printed circuit board may include traces that are printed on selected layers of the board so that the traces extend to the edge of the corresponding layer. When the layers are assembled together, the ends of the traces may be viewable on a side of the printed circuit board. The traces may be arranged to convey information. For example, trace ends may be readable as one or more binary words, as alphanumeric characters or as a bar code.
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