| 摘要 |
A plane film cassette has a housing with an illumination opening and a slot, a light-protective cover insertable into the slot to protect a film, and light-tight elements located at opposite sides of the slot and magnetically attractable towards one another so that one of the light-tight elements can move towards the other light-tight element, whereby with the inserted light-protective cover this light-tight element abuts against the latter and with the withdrawn light-protective cover the light-tight elements abut against one another in light-tight manner.
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