| 摘要 |
PROBLEM TO BE SOLVED: To provide a printed circuit board to clearly discriminate through-holes for ordinary signals and through-holes for power supply and ground. SOLUTION: In the printed circuit board including through holes for signal lines used for ordinary signals and through holes for power supply-ground used for power supply or ground, a discrimination mark is formed by the printing method in order to discriminate the through holes for signal line and the through holes for power supply-ground. COPYRIGHT: (C)2005,JPO&NCIPI
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