| 摘要 |
The device has a base (8) with a support side in contact with a friction lining (4) of a roof and an outer side visible from inside a cab interior. A body (9) is positioned in an orifice of the lining and a rear apron (2) using retention units (16), a projecting part and a boss. A magnet is inserted in a central part of the body and the base, and is unblocked on the outer side by forming a support surface for a bolt (6a).
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