CIRCUIT BOARD CASE

PROBLEM TO BE SOLVED: To provide a circuit board case capable of preventing the fraudulent exchange of a ROM and tightly closing an opening formed when inspecting the ROM for two or more times. SOLUTION: When detaching a small cover 64 from an opening window part 60, a main connecting piece 104 and a sub connecting piece 106 connected to cylindrical members 102 (the first and fifth ones when it is the first time) are cut off. Thus, the cylindrical members 102 are separated from the small cover 64 and the small cover 64 can be detached. After an inspection and storage, when closing the opening window part 60 by the small cover 64 again, it is fixed using the second and sixth cylindrical members 102 from the left. Thereafter, when detaching it, the main connecting piece 104 and the sub connecting piece 106 connected to the second and sixth cylindrical members 102 are cut off. By repeating that, opening for three times and fixation for four times are made possible. COPYRIGHT: (C)2008,JPO&INPIT