| 摘要 |
PROBLEM TO BE SOLVED: To realize a board box helping easily find that a seal is broken. SOLUTION: In the board box 900, an upper case 500 and a lower case 600 are united and fixed by external screws 400 in the interiors of an outermost casing. Covering portions 300 cover the external screws 400 so as to make them naturally require breading when operating from the outside to remove the external screws 400. Fixing portions 200 fix the covering portion 300 by getting into one holes provided in the covering portions 300 from one side and projecting out from the other. By checking the covering portions 300 for breakage, it can be easily fudged whether the board box 900 has been unsealed.
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