| 摘要 |
PROBLEM TO BE SOLVED: To easily realize the strength change in accordance with a specified form to easily realize a high reliability and high accuracy electronic circuit unit assembly. SOLUTION: A main printed wiring board 12 is disposed in an opening of a rack member 10 to close the opening and board reinforcements 15 have sandwiching parts 153 which sandwich a part of both sides of the periphery of the board 12, so that the board strength of the wiring board 12 can be varied and set according to the number of the installed reinforcements 15.
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