| 摘要 |
An apparatus including a body part configured to receive a replaceable internal part, a first cover part configured to be movable between an open position and a closed position, a second cover part configured to be movable between an open position and a closed position, and when in said closed position, to cover the replaceable internal part. A locking mechanism is configured to lock the second cover part to the body part and the locking mechanism is configured to be releasable, when the first cover part is in said open position and the locking mechanism is configured to be unreleasable, when the first cover part is in said closed position.
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