| 摘要 |
There is described a safety door the lock of which, upon turning of the key, outwardly displaces the bolt which, upon engagement in the door frame, pushes out for other bolts that engage in the door. Besides, the latter has a hinge co-extensive with its height and a side provided with five dead bolts which engage in the other side of the hinge upon closing of the door. A metal plate covers each of the opposite faces of the door.
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