| 摘要 |
PROBLEM TO BE SOLVED: To prevent an insertion mistake when a connector having the small number of poles is inserted into a printed wiring board having insertion holes Y having the large number of poles. SOLUTION: In a printed wiring board 11 having insertion holes Y adaptive to the large number of poles, there is provided an incorrect insertion preventing means that insertion holes Z exceeding the number of poles are set as reference holes of an automatically mounting part 14, whereby an incorrect insertion into the insertion holes Z exceeding the number of poles can be prevented.
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