| 摘要 |
An optical disk cartridge includes a casing accommodating an optical disk therein and having an accommodating section formed by a pair of top and bottom walls, and an operation part slidably accommodated in the accommodating section of the casing. In the optical disk cartridge, the casing is provided with a discrimination hole at position opposing an operating slot, and a closing part at a section thereof other than the discrimination hole opposing the operating slot so that the operation part opens and closes the discrimination hole.
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